1405-7425 1405-7425 S1405-74252018000400157 10.22185/24487147.2018.98.39 Ecuador 00 12 2018 00 12 2018 24 98 157 183

1997 1979 27 2002 2000 Banco Mundial 2016 2001 1985 2009 9 2 2 27-40 1889 1 1970 1 y 2 1 y 2 1998 1998 66 5 5 521-31 2002 1889 1 1959 20 280-96 Desal 1969 23 2 2 247-67 2000 68 263-70 1956 1991 1973 1967 1952 30 1947 26 1947-8 1976 1978 2005 1980 95 567-73 2002 2014 1974 1846 1974 1943 50 1965 1938 3 5 5 672-82 1950 40-105 1998 2000 1997 7 153-63 NASA 2016 1928 33 2017 36 36 1996 49 353-76 2000 82 3 3 462-71 2005 1993 1998 133 133 1986 1966 2009 1982 1990 1985 1984 1999 2009 Stouffer S.A. Star, S.A. 1949 1981 1999 Madrid 1988 2 1 1 191-202 1918 1979 UNESCO 1960 2002 1982 17 99-113 1979 93 321-4