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1. Historical United States County Boundaries, 1900

1900. Earle, Carville, Heppen, John, Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology., Otterstrom, Samuel, and Cao, Changyong. This polygon shapefile contains county boundaries for the United States in 1900. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.