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1. Central Shanghai, 1991
1991. Digital Social Science Center (DSSC), Columbia University Libraries and United States. Central Intelligence Agency. This is a scanned version of the 1991 paper map entitled: Central Shanghai published by the United States Central Intelligence Agency.. The map wa... United States. Central Intelligence Agency.
2. United States Income and Employment 1991-1992
1991. National Atlas of the United States. This map layer portrays 1991 and 1992 estimates for total personal income, per capita personal income, annual number of full-time and part-time job... National Atlas of the United States.
3. Wetland resources of the United States, 1991
1991. Digital Social Science Center (DSSC), Columbia University Libraries, National Wetlands Inventory (U.S.), Dahl, Thomas E., U.S. Fish and Wildlife Service., and Geological Survey (U.S.). This is a scanned version of the 1991 paper map entitled: Wetland resources of the United States published by the United States Fish and Wildlife S... The Service.