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Map of a reconnaissance of the approaches to Philadelphia showing the positions and lines of defence on the north front of the city
Topographic map of northern Philadelphia and small adjacent part of Montgomery County showing Civil War earthworks and batteries. Relief shown by contours and hachures. Signed in handwriting (brown ink): George Davidson, Assistant Engineer Fortifications. Pen-and-ink, red ink (contours), and watercolors. Former ownership rubber-stamping at foot of title: U.S.C. & G. Survey, Library and Archives, no. 126. "No. 2868X" and "854W 1863" (former Coast Survey ...
United States Coast Survey - Bache, A. D. (Alexander Dallas) - Davidson, George - Fauntleroy, A. R.