1862
- order, 8 August 1862, from General Wadsworth, about arrests. (OR series 2 volume 4 page 361)
- inspection of troops at Long Bridge, Washington DC, 19 April 1862 (OR series 1 volume 15 pages 225-226)
- General Wadsworth's command, 1 April 1862 (OR series 1 volume 5 pages 21-22)
- statement of troops in the Military District of Washington, Brig. Gen. James S. Wadsworth commanding, May 31, 1862. (OR series 1 volume 12 part 3 page *)
- statement of troops in Tyler's Brigade, 1 September 1862 (OR series 1 volume 12 part 3 pages 790-791
- organization of the Army of the Potomac, Maj. Gen. George B. McClellan, U. S. Army, Commanding, September 14-17, 1862. (OR series 1 volume 19 part 1, at page 175)
- report by Brig. Gen. Humphreys about reconnaissance on 16-17 October 1862. (OR series 1 volume 19 part 2 pages 85-88)
- statement by Brig. Gen. Humphreys about the formation of his division and its arrival at Antietam (OR series 1 volume 19 part 1 pages 370-373)
- organization of the Union forces at the battle of Fredericksburg, 11-15 December 1862 (OR series 1 volume 21 page 56)
- report by Captain Lentz of 16 December 1862, Fredericksburg Virginia (OR series 1 volume 21 page 403)
- report by Col. Gregory, about Frederickburg (OR series 1 volume 21 pages 438-440)
- report by Brig. Gen. Tyler, First Brigade, about Frederickburg (OR series 1 volume 21 pages 436-438)
- report by Brig. Gen. Humphreys, Third Division, about Fredericksburg (OR series 1 volume 21 pages 430-434)
- report by Brig. Gen. Butterfield, Fifth Corps, about Fredericksburg (OR series 1 volume 21 pages 399-402)
- casualties at the battle of Fredericksburg (OR series 1 volume 21 page 137)
- organization of the Army of the Potomac on 31 December 1862 (OR series 1 volume 21 at page 931)
1863
- organization of the Army of the Potomac, relevant to the 91st PA, on 1-6 May 1863 (OR series 1 volume 25 part 1 at page 164)
- casualties at the Battle of Chancellorsville (OR series 1 volume 25 part 1 at page 181)
- report by Erastus B Tyler (brigade commander) about the Battle of Chancellorsville on 3 May 1863. (OR series 1 volume 25 part 1 pages 550-553)
- report by Andrew A Humphreys (division commander) about the Chancellorsville Campaign (OR series 1 volume 25 part 1 pages 545-550)
- organization of the Army of the Potomac during the Gettysburg campaign, 3 June-3 August 1863 (OR series 1 volume 27 part 1 page 162)
- report of Col. Garrard (third brigade), about Battle of Gettysburg. (OR series 1 volume 27 part 1 pages 651-652)
- casualties at the Battle of Gettysburg (OR series 1 volume 27 part 1 page 180)
- organization of the Army of the Potomac, 31 July 1863. (OR series 1 volume 27 part 3 page 800)
- organization of the Army of the Potomac, 31 August 1863. (OR series 1 volume 29 part 2 page 124)
- organization of the Army of the Potomac, 10 October 1863. (OR series 1 volume 29 part 1 page 231)
- organization of the Army of the Potomac, 20 November 1863. (OR series 1 volume 29 part 1 page 672)
- organization of the Army of the Potomac, 31 December 1863. (OR series 1 volume 29 part 2 page 603)
1864
- letter, Gen. George Meade, about veterans' furlough for the 91st PA and other regiments. (OR series 1 volume 33 pages 357-358)
- organization of the Army of the Potomac, 31 January 1864. (OR series 1 volume 33 page 468)
- organization of the Army of the Potomac, 30 April 1864. (OR series 1 volume 33 page 1039)
- organization of the Army of the Potomac, 5 May 1864. (OR series 1 volume 36 part 1 page 109)
- casualties at the Battle of the Wilderness, 5-7 May 1864 (OR series 1 volume 36 part 1 page 123)
- casualties at Spottsylvania Court House, 8-21 May 1864 (OR series 1 volume 36 part 1 page 140)
- casualties at North Anna, Pamunkey, and Totopotomoy, 22 May-1 June 1864 (OR series 1 volume 36 part 1 page 156)
- casualties at Cold Harbor, Bethesda Church, etc., 2-15 June 1864 (OR series 1 volume 36 part 1 page 170)
- organization of the Army of the Potomac, 31 May 1864 (OR series 1 volume 36 part 1 page 201)
- report by Maj John D Lentz of the 91st's actions from 4 May 1864 to 30 July 1864. (OR series 1 volume 36 part 1 pages 555-557 and series 1 volume 40 part 1 pages 461-462)
- orders, 3 August 1864 (OR series 1 volume 42 part 2 page 29)
- request by General Griffin to consolidate division into a brigade (OR series 1 volume 42 part 2 page 999)
- order about cutting brush in front of Gregory's line (OR series 1 volume 42 part 2 p.*)
- recommendation for Col. Gregory's promotion by Brig. Gen. Griffin (OR series 1 volume 42 part 3 pages 59-60)
- announcement of Col. Gregory's promotion (OR series 1 volume 42 part 3 page 259)
- report of action on 27-28 October. OR series 1 volume 42 part 1 page 459]
- transfer of 91st from the 2nd to the 3rd brigade OR series 1 volume 42 part 3 p.*