MapDelaware, District of Columbia, and Maryland "Sources: Base map from U.S. Geological Survey, Delaware and Maryland, 1973. County, county subdivision, and place boundaries certified by local officials, January 1, 1980." Includes indexes and inset. Available also through the...
- Contributor: United States. Bureau of the Census. Data Preparation Division - United States. Bureau of the Census. Geography Division
- Date: 1980