1. U.S. Counties (Generalized) Polygon Princeton University Public content 2002. Esri. U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia. Esri.
2. Zambia population density and absentees, 1938 Polygon Princeton University Public content 1938. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing population density by district in Northern Rhodesia (Zambia) for 1938. The dataset also includes the percentage of absentees...