The base maps were developed from U. S. Geological Survey Digital Line Graph files State Boundaries of the U. S., November, 1999, and the feature location data was based on
The projection is an Albers Equal-Area Conic.
- The United States  published by National Geographic Society, November 1993, and
- Battlefields of the Civil War with Descriptive Notes published by National Geographic Society, April, 1961.
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Revised December15, 2001