HUSCO Maryland 1860-1880 (Projected)
- The features represent the county boundaries in Maryland from the years 1860-1880. The Historical United States County Boundary Files 1790 - 1999 (or HUSCO 1790 - 1999) contains ArcView shapefile format U.S. county boundary files for each decade from 1790 through 1990 (also 1999). Files include county and state names and FIPS identification numbers.
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