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![[Map of part of Montgomery County showing] Topographical Approaches on the Left Bank of the Potomac to Washington City from the North West. Surveyed by Parties of U. S. Coast Survey detailed by A. D. Bache, Supt., to act under the orders of Lieut. Col. J. N. Macomb, Chf. Topl. Engr. of the Army of the Potomac. Parts of Sept. & Oct. 1861. Field work by F. W. Dorr & C. Rockwell, U.S.C.S. ...Drawn by E. Hergesheimer. Photographs by G. Mathiot and D. Hinkle.](https://cache.getarchive.net/Prod/thumb/cdn10/L3Bob3RvLzE4OTAvMTIvMzEvbWFwLW9mLXBhcnQtb2YtbW9udGdvbWVyeS1jb3VudHktc2hvd2luZy10b3BvZ3JhcGhpY2FsLWFwcHJvYWNoZXMtb24tdGhlLWxlZnQtOTI3ZjUzLTEwMjQuanBn/40/38/webp "[Map of part of Montgomery County showing] Topographical Approaches on the Left Bank of the Potomac to Washington City from the North West. Surveyed by Parties of U. S. Coast Survey detailed by A. D. Bache, Supt., to act under the orders of Lieut. Col. J. N. Macomb, Chf. Topl. Engr. of the Army of the Potomac. Parts of Sept. & Oct. 1861. Field work by F. W. Dorr & C. Rockwell, U.S.C.S. ...Drawn by E. Hergesheimer. Photographs by G. Mathiot and D. Hinkle.")
[Map of part of Montgomery County showing] Topographical Approaches on...
Maryland, the District of Columbia, and the Potomac River
Nautical Chart of Brazos Santiago, Texas Showing Location of Lighthous...
Map and Plans Relating to the Lighthouse at Lazaretto Point, Maryland