Riggs & Co. to Thomas Lincoln Casey, November 16, 1882

Risheill Hooge to Thomas Lincoln Casey, January 10, 1870

Risheill Hooge to Thomas Lincoln Casey, January 24, 1870, receipt

Robert B. Hunt to Thomas Lincoln Casey, March 16, 1886

Robert C. Winthrop to Thomas Lincoln Casey, December 29, 1881

Robert C. Winthrop to Thomas Lincoln Casey, March 20, 1882

Robert C. Winthrop to Thomas Lincoln Casey, May 16, 1886

Robert C. Wood to Thomas Lincoln Casey, June 21, 1889

Robert Creighton to Thomas Lincoln Casey, August 26, 1881

Robert Creighton to Thomas Lincoln Casey, August 30, 1881

Robert Creighton to Thomas Lincoln Casey, September 2, 1881

Robert Creighton to Thomas Lincoln Casey, September 3, 1881

Robert F. Stevens to General A. A. Humphreys; A. A. Humphreys to Thomas Lincoln Casey, February 20, 1872

Robert F. Weir to Emma Weir Casey, January 22, 1895, telegram

Robert F. Weir to Thomas Lincoln Casey, April 10, 1894, telegram

Robert F. Weir to Thomas Lincoln Casey, April 11, 1894, telegram

Robert F. Weir to Thomas Lincoln Casey, October 12, 1893; Thomas Lincoln Casey to [Henry] M. Adams and H. M. A. to Thomas Lincoln Casey to Thomas Lincoln Casey, October 13, 1893

Robert H. Hunt to Thomas Lincoln Casey, February 25, 1886 (1)

Robert H. Hunt to Thomas Lincoln Casey, February 25, 1886 (2)

Robert H. Hunt to Thomas Lincoln Casey, February 26, 1886

Robert H. Hunt to Thomas Lincoln Casey, June 25, 1888

Robert H. Hunt to Thomas Lincoln Casey, November 9, 1895

Robert Herrick Hunt to Thomas Lincoln Casey, July 13, 1893

Robert J. Stevens to Alexander Ramsey, January 29, 1881

Robert J. Stevens to Alexander Ramsey, January 29, 1881.

Robert J. Stevens to Thomas Lincoln Casey, April 11, 1882

Robert J. Stevens to Thomas Lincoln Casey, December 24, 1873

Robert J. Stevens to Thomas Lincoln Casey, Feburary 27, 1872

Robert [Todd] Lincoln to Thomas Lincoln Casey, December 17, 1881

Robert [W.] Weir to Thomas Lincoln Casey, March 22, 1888

Robertson & Blackford to Thomas Lincoln Casey, February 1, 1888

Roger Jones to Thomas Lincoln Casey, July 5, 1878

Rooms of the American Home Missionary Society to Thomas Lincoln Casey, January 23, 1856

Rosa Wright Smith to Thomas Lincoln Casey, July 14, 1894

Roster of Engineers, August 1, 1894, (1)

Roster of Engineers, August 1, 1894, (2)

Roster of Engineers, August 1, 1894, (3)

Rough draft of notes for Memorandum in [illegible] Report, undated

Rough draft of original report on monument, July 27, 1878

Rough of Second Report on Monument Completed, December 13, 1886

Rufus D. Bean to Thomas Lincoln Casey, August 16, 1871

Rufus E. Lister to Thomas Lincoln Casey, February 2, 1894

Rufus Naple to Thomas Lincoln Casey, May 1, 1886, General Lewis Hunt, copy, May 16, 1886

Russell Sage to Thomas Lincoln Casey, April 24, 1886

Rutherford B. Hayes to Thomas Lincoln Casey, undated [November 1878]

S. Anna Gould to Thomas Lincoln Casey, April 5, 1886

S. B. Elkins to Thomas Lincoln Casey, calling card; May, 1892

S. B. Elkins to Thomas Lincoln Casey, May 27, 1892

S. D. Larnill to Capt. [George] W. Davis, February 24, 1881

S. D. Miller to Mr. Warren, February 13, 1893