R. T. Brown to Thomas Lincoln Casey, June 27, 1892

R. T. W. Duke to Thomas Lincoln Casey, May 10, 1882

R. W. Meade to Thomas Lincoln Casey, April 15, 1886

R. W. Petrikin to Thomas Lincoln Casey, December 22, 1868

R. W. Raymond to Thomas Lincoln Casey, June 24, 1882

R. W. [Lowry] to Thomas Lincoln Casey, February 3, 1892

R. [Illegible]. to Thomas Lincoln Casey, undated [1882]

R. [Rutherford] P. Hayes to Thomas Lincoln Casey, November 29, 1889

Ralph Abercrombie to Thomas Lincoln Casey, May 16, 1893

Randall Baremore to Thomas Lincoln Casey, April 4, 1859

Range of [illegible] at Monument, 1883

Receipt of Shipment to Thomas Lincoln Casey, March 23, 1895

Record of plumb spots carved down to floor, undated

Record of Tests of Portland Cement Company, July 5, 1879

Redfield Proctor to Thomas Lincoln Casey, February 18, 1893

Relative Levels of Goddess of Liberty on Capitol, undated

Report of tests for tensils strength, January 27, 1882

Report of William Dougherty of the expenses of the Monument Foundation, February 7, 1849

Robert Winthrop to Thomas Lincoln Casey, June 6, 1889

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

S. E. Tillman to Thomas Lincoln Casey, December 18, 1882

S. E. Tillman to Thomas Lincoln Casey, June 11, 1872

S. Fannie Briggs to Thomas Lincoln Casey, undated [1880]

S. H. Hacker to Thomas Lincoln Casey, June 21, 1882

S. H. Kauffmann to Thomas Lincoln Casey, June 10, 1882

S. M. Mansfield to Thomas Lincoln Casey, June 27, 1894

S. P. Langley to Thomas Lincoln Casey, May 18, 1893

S. Polaud to Thomas Lincoln Casey, February 25, 1889

S. Polaud to Thomas Lincoln Casey, February 9, 1889