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- Official map of the lower Potomac River picket lines Jany 1862. (1)
- Official map of the Union works in front of Yorktown, Va. (1)
- Official plan of the siege of Yorktown, Va. : (2)
- Official plan of the siege of Yorktown, Va., conducted by the Army of the Potomac under command of Maj. Gen. George B. McClellan, U.S.A., April 5th to May 3rd 1862 (2)
- Ohio River between Mound City and Cairo. (1)
- One hundred & fifty miles around Richmond. 10th ed. (1)
- One hundred & fifty miles around Richmond. 12 ed. (1)
- One hundred & fifty miles around Richmond. 9th ed. (1)
- One hundred and fifty miles around Richmond (7)
- Operations of the Army of the Potomac, May & June 1864. (2)
- Orange County, Va. / (4)
- [Orangeburgh District, South Carolina] / (1)
- Order of attack on Fort Fisher by the Squadron under command of Rear Admiral D. D. Porter, U.S.N. in the combined naval and military operations which resulted in the capture of the Rebel defences at New Inlet, N.C. January 14th & 15th 1865. (1)
- Oregon Inlet, N. Carolina (1)
- Original formation of Union forces around Petersburg. (1)
- Original maps of Forts Henry & Donelson and vicinity. (1)
- [Original plattings of forts at St. Louis, Mo. 186-]. (1)
- Our naval and military operations at a glance. The coast and land line of the rebellious states-the Union blockade of the Atlantic and Gulf coast-the rebel batteries on the Mississippi-the forts on the southern sea line (1)
- [Outline map of Hampton Roads, and the vicinity of Norfolk, Va.]. (1)
- Outworks nos. 1 & 2 to battery no. 6. (1)
- [Overlay to the map of the siege of Petersburg, 1864-5]. (1)