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1. Historical United States County Boundaries, 1830

1830. 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 1830. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

2. North American Bat Ranges, 1830-2008

1830. National Atlas of the United States. This poygon shapefile portrays the distributions of United States and Canadian bat species during the past 100-150 years (1830-2009). The specimen ... National Atlas of the United States.