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1. Maryland County Boundary Files, 1860-1880

1999. Louisiana State University (Baton Rouge, La.).; Dept. of Geography and Anthropology., Earle, Carville., Heppen, John., and Otterstrom, Samuel. The features represent the county boundaries in Maryland from the years 1860-1880. The Historical United States County Boundary Files 1790 - 1999 (...

2. Maryland County Boundary FIles,, 1890-1910

1999. Louisiana State University (Baton Rouge, La.).; Dept. of Geography and Anthropology., Earle, Carville., Heppen, John., and Otterstrom, Samuel. This shapefile contains county boundaries for Maryland for the years 1980-1910. The Historical United States County Boundary Files 1790 - 1999 (or...