<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-4611</journal-id>
<journal-title><![CDATA[Investigaciones geográficas]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. Geog]]></abbrev-journal-title>
<issn>0188-4611</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geografía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-46111975000200005</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Aztec soil science]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Williams]]></surname>
<given-names><![CDATA[Bárbara J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,University of Wisconsin  ]]></institution>
<addr-line><![CDATA[Madison Wisconsin]]></addr-line>
<country>Estados Unidos de América</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>1975</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>1975</year>
</pub-date>
<numero>7</numero>
<fpage>115</fpage>
<lpage>120</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-46111975000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-46111975000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-46111975000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Ethnographic, documentary and archaeological evidence indicates that the pre-Hispanic peoples of the Valley of Mexico developed a sophisticated technology to exploit their physical environment.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La evidencia etnográfica, arqueológica y documental indica que los pueblos prehispánicos del Valle de México desarrollaron una bien elaborada tecnología para explotar su medio físico.]]></p></abstract>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="4"><b>Aztec soil science</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>B&aacute;rbara J. Williams*</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">* <i>Investigadora de la Universidad de Wisconsin.</i></font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>         <p align="justify"><font face="verdana" size="2">Ethnographic, documentary and archaeological evidence indicates that the pre&#45;Hispanic peoples of the Valley of Mexico developed a sophisticated technology to exploit their physical environment.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La evidencia etnogr&aacute;fica, arqueol&oacute;gica y documental indica que los pueblos prehisp&aacute;nicos del Valle de M&eacute;xico desarrollaron una bien elaborada tecnolog&iacute;a para explotar su medio f&iacute;sico.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/igeo/n7/n7a5.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p> 	    <!-- ref --><p align="justify"><font face="verdana" size="2">Basinski, J. J., "The Russian Approach to Soil Classification and its Recent Development", in J. V. Drew (ed.) <i>Selected Papers in Soil Formation and Classification</i> (Madison, Wi.: Soil Science Society of America. 1967), pp. 402&#45;414.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614875&pid=S0188-4611197500020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">Crompton, E., "Soil Formation", in J .V. Drew (ed.) <i>Selected Papers in Soil Formation and Classification</i> (Madison, Wi.: Soil Science Society of America, 1967), pp. 3&#45;15.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614877&pid=S0188-4611197500020000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">Gibson, Charles, <i>The Aztecs Under Spanish Rule: A History of the Indians of the Valley of Mexico, 1510&#45;1810</i> (Stanford, Ca.: Stanford University Press, 1964).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614879&pid=S0188-4611197500020000500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Islas Esc&aacute;rcega, Leovigildo, <i>Diccionario Rural de M&eacute;xico</i> (M&eacute;xico, D. F.: Editorial Comaval, 1961).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614881&pid=S0188-4611197500020000500004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Manil, G., "General Considerations on the Problem of Soil Classification", in J. V. Drew (ed.) <i>Selected Papers in Soil Formation and Classification</i> (Madison, Wi.: Soil Science Society of America, 1967), pp. 393&#45;401.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614883&pid=S0188-4611197500020000500005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Mart&iacute;n de la Cruz, <i>Libellus de Medicanlibus Indorum Herbis: Manuscrito Azteca de 1552 seg&uacute;n Traducci&oacute;n Latina de Juan Badiano, versi&oacute;n espa&ntilde;ola con estudios y comentarios por diversos autores</i> (M&eacute;xico, D. F.: Instituto Mexicano del Seguro Social, 1964).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614885&pid=S0188-4611197500020000500006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Molina, Alonso de, <i>Vocabulario en Lengua Castellana y Mexicana</i> (Madrid: Ediciones Cultura Hisp&aacute;nica, 1944).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614887&pid=S0188-4611197500020000500007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">Pe&ntilde;afiel, Antonio <i>Nomenclatura Geogr&aacute;fica de M&eacute;xico</i> (M&eacute;xico, D. F.: Secretar&iacute;a de Fomento, 1897).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614889&pid=S0188-4611197500020000500008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Sahag&uacute;n, Fray Bernardino de, <i>The Florentine Codex: General History of the Things of New Spain,</i> traducido por C. E. Dibble y A. J. O. Anderson (Santa Fe: The School of American Research and the University of Utah, 1950&#45;1971).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614891&pid=S0188-4611197500020000500009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Sahag&uacute;n, Fray Bernardino de, <i>Historia General de las Cosas de Nueva Espa&ntilde;a</i> (M&eacute;xico, D. F.: Editorial Pedro Robredo, 1938).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614893&pid=S0188-4611197500020000500010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Sahag&uacute;n, Fray Bernardino de, <i>Historia General de las Cosas de Nueva Espa&ntilde;a,</i> editado por Francisco del Paso y Troncoso (Madrid: Hauser y Menet, 1905).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614895&pid=S0188-4611197500020000500011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Santamar&iacute;a, Francisco J., <i>Diccionario de Mejicanismos</i> (M&eacute;xico, D. F.: Editorial Porr&uacute;a, S. A., 1959).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614897&pid=S0188-4611197500020000500012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">Seler, Eduard, "The Mexican Picture Writings of Alexander von Humboldt", Bureau of American Ethnology, <i>Bulletin</i> 28 (Washington, D.C.: Smithsonian Institution, 1904).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614899&pid=S0188-4611197500020000500013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Simonson, Roy W., "Soil Classification in the United States", en J. V. Drew (ed.) <i>Selected Papers in Soil Formation and Classification</i> (Madison, Wi.: Soil Science Society of America, 1967), pp. 415&#45;428.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614901&pid=S0188-4611197500020000500014&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Stevens, Rayfred L., "The Soils of Middle America and their Relation to Indian Peoples and Cultures", en Robert C. West (ed.) <i>Handbook of Middle American Indians, Vol. 1, Natural Environment and Early Cultures</i> (Austin: University of Texas Press, 1964).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614903&pid=S0188-4611197500020000500015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Williams, Barbara J., "Tepetate in the Valley of Mexico"<i>, Annals of the Association of American Geographers,</i> Vol. 62:4, 1972, pp. 618&#45;626.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4614905&pid=S0188-4611197500020000500016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Basinski]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[The Russian Approach to Soil Classification and its Recent Development]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Drew]]></surname>
<given-names><![CDATA[J. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[Selected Papers in Soil Formation and Classification]]></source>
<year>1967</year>
<page-range>402-414</page-range><publisher-loc><![CDATA[Madison^eWi Wi]]></publisher-loc>
<publisher-name><![CDATA[Soil Science Society of America]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Crompton]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Soil Formation]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Drew]]></surname>
<given-names><![CDATA[J .V.]]></given-names>
</name>
</person-group>
<source><![CDATA[Selected Papers in Soil Formation and Classification]]></source>
<year>1967</year>
<page-range>3-15</page-range><publisher-loc><![CDATA[Madison^eWi Wi]]></publisher-loc>
<publisher-name><![CDATA[Soil Science Society of America]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gibson]]></surname>
<given-names><![CDATA[Charles]]></given-names>
</name>
</person-group>
<source><![CDATA[The Aztecs Under Spanish Rule: A History of the Indians of the Valley of Mexico, 1510-1810]]></source>
<year>1964</year>
<publisher-loc><![CDATA[Stanford^eCa Ca]]></publisher-loc>
<publisher-name><![CDATA[Stanford University Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Islas Escárcega]]></surname>
<given-names><![CDATA[Leovigildo]]></given-names>
</name>
</person-group>
<source><![CDATA[Diccionario Rural de México]]></source>
<year>1961</year>
<publisher-loc><![CDATA[México^eD. F. D. F.]]></publisher-loc>
<publisher-name><![CDATA[Editorial Comaval]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Manil]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[General Considerations on the Problem of Soil Classification]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Drew]]></surname>
<given-names><![CDATA[J. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[Selected Papers in Soil Formation and Classification]]></source>
<year>1967</year>
<page-range>393-401</page-range><publisher-loc><![CDATA[Madison^eWi Wi]]></publisher-loc>
<publisher-name><![CDATA[Soil Science Society of America]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cruz]]></surname>
<given-names><![CDATA[Martín de la]]></given-names>
</name>
</person-group>
<source><![CDATA[Libellus de Medicanlibus Indorum Herbis: Manuscrito Azteca de 1552 según Traducción Latina de Juan Badiano, versión española con estudios y comentarios por diversos autores]]></source>
<year>1964</year>
<publisher-loc><![CDATA[México^eD. F. D. F.]]></publisher-loc>
<publisher-name><![CDATA[Instituto Mexicano del Seguro Social]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Molina]]></surname>
<given-names><![CDATA[Alonso de]]></given-names>
</name>
</person-group>
<source><![CDATA[Vocabulario en Lengua Castellana y Mexicana]]></source>
<year>1944</year>
<publisher-loc><![CDATA[Madrid ]]></publisher-loc>
<publisher-name><![CDATA[Ediciones Cultura Hispánica]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peñafiel]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
</person-group>
<source><![CDATA[Nomenclatura Geográfica de México]]></source>
<year>1897</year>
<publisher-loc><![CDATA[México^eD. F. D. F.]]></publisher-loc>
<publisher-name><![CDATA[Secretaría de Fomento]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sahagún]]></surname>
<given-names><![CDATA[Fray Bernardino de]]></given-names>
</name>
<name>
<surname><![CDATA[Dibble]]></surname>
<given-names><![CDATA[C. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Anderson]]></surname>
<given-names><![CDATA[A. J. O.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Florentine Codex: General History of the Things of New Spain]]></source>
<year>1950</year>
<month>-1</month>
<day>97</day>
<publisher-loc><![CDATA[Santa Fe ]]></publisher-loc>
<publisher-name><![CDATA[The School of American Research and the University of Utah]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sahagún]]></surname>
<given-names><![CDATA[Fray Bernardino de]]></given-names>
</name>
</person-group>
<source><![CDATA[Historia General de las Cosas de Nueva España]]></source>
<year>1938</year>
<publisher-loc><![CDATA[México^eD. F. D. F.]]></publisher-loc>
<publisher-name><![CDATA[Editorial Pedro Robredo]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sahagún]]></surname>
<given-names><![CDATA[Fray Bernardino de]]></given-names>
</name>
<name>
<surname><![CDATA[Paso y Troncoso]]></surname>
<given-names><![CDATA[Francisco del]]></given-names>
</name>
</person-group>
<source><![CDATA[Historia General de las Cosas de Nueva España]]></source>
<year>1905</year>
<publisher-loc><![CDATA[Madrid ]]></publisher-loc>
<publisher-name><![CDATA[Hauser y Menet]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Santamaría]]></surname>
<given-names><![CDATA[Francisco J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Diccionario de Mejicanismos]]></source>
<year>1959</year>
<publisher-loc><![CDATA[México^eD. F. D. F.]]></publisher-loc>
<publisher-name><![CDATA[Editorial Porrúa, S. A.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Seler]]></surname>
<given-names><![CDATA[Eduard]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[The Mexican Picture Writings of Alexander von Humboldt]]></article-title>
<collab>Bureau of American Ethnology</collab>
<source><![CDATA[Bulletin]]></source>
<year>1904</year>
<publisher-loc><![CDATA[Washington^eD.C. D.C.]]></publisher-loc>
<publisher-name><![CDATA[Smithsonian Institution]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Simonson]]></surname>
<given-names><![CDATA[Roy W.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Soil Classification in the United States]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Drew]]></surname>
<given-names><![CDATA[J. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[Selected Papers in Soil Formation and Classification]]></source>
<year>1967</year>
<page-range>415-428</page-range><publisher-loc><![CDATA[Madison^eWi Wi]]></publisher-loc>
<publisher-name><![CDATA[Soil Science Society of America]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stevens]]></surname>
<given-names><![CDATA[Rayfred L.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[The Soils of Middle America and their Relation to Indian Peoples and Cultures]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[West]]></surname>
<given-names><![CDATA[Robert C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Handbook of Middle American Indians, Vol. 1, Natural Environment and Early Cultures]]></source>
<year>1964</year>
<publisher-loc><![CDATA[Austin ]]></publisher-loc>
<publisher-name><![CDATA[University of Texas Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Williams]]></surname>
<given-names><![CDATA[Barbara J.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Tepetate in the Valley of Mexico]]></article-title>
<source><![CDATA[Annals of the Association of American Geographers]]></source>
<year>1972</year>
<volume>62</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>618-626</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
