MapGeneral diagram : [western Philadelphia city and adjacent portions of Delaware and Montgomery counties, Pennsylvania]. Topographic map showing proposed and existing Civil-War batteries and defensive positions immediately west of Philadelphia. Relief shown by contours and hachures. Title from southern sheet. Partial tracing of the 1863 ms. topographic map showing 1st- and 2nd-class fortifications at Philadelphia (CW 358.22). Oriented with north to the right. Pen-and-ink, red ink (contours), and watercolors. Drawn in 2 segments (sheets): [Northern] -- [Southern]. "No. 2866" ...
- Contributor: United States Coast Survey - Bache, A. D. (Alexander Dallas)
- Date: 1863
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