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Demographic surveys
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Population
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Sex ratio
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Polygon
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Year
1990
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1. 1990 County Boundaries of China with Population Census Data, Part 1
1990. This polygon shapefile represents the 1990 County Boundaries for China. The layer includes population census data and was primarily based on the "T... Beijing Hua tong ren shi chang xin xi you xian ze ren gong si.