A bivariate choropleth map displays two variables on a single map by combining two different sets of graphic symbols or colors. It usually illustrates the relationship between the two. The map I found (very outof focus) displays the land use, life expectancy, and GNP per capita in Africa in 1989. I found it here http://image24.webshots.com/25/3/32/3/286333203FPiEKt_fs.jpg
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