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| | The Civil War Defenses of Washington: Historic Resource Study (Chapter 4 Endnotes) |
 | | Lyon; RG393, Preliminary Inventory 172, Part 2, Defenses of Washington, South of the Potomac, Army of the Potomac, Entry 6744, Letters Received and Sent, March-December 1862, Edward Frost, Engineer, Engineer Office, Roach's House, Defenses of Washington, South of the Potomac, to Major L. Hunt, A.A.G., andc., November 19, 1862. |
 | | RG393, Preliminary Inventory 172, Part 2, Defenses North of the Potomac, 22nd Army Corps, Entry 6606, Letters Sent, January 1864- August 1865, Volume 162/333DW, page 64, to the Secretary of War, Endorsement of Col. B.S. Alexander on letter of Mr. |
 | | Edited by David H. White and John W. Gordon (Charleston, SC: The Citadel, 1979), 26-30; Edward M.. |
| www.cr.nps.gov /history/online_books/civilwar/hrs1-4n.htm (2781 words) |
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