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Shapefile
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Princeton
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Polygon
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1981
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1. China county map, 1981
1981. All China Marketing Research Co., Ltd. Map of administrative divisions in China, at the county level and above, for the year 1981.
2. District boundary of India, 1981
1981. ML InfoMap Pvt. Ltd. District boundary data of India, 1981. Includes socio-demographic data. ML InfoMap Pvt. Ltd.