Comparison of Estimate and Actual time taken in Cutting Pyramidion, March 18, 1885

Computations of Height, November 24, 1879

Concerning Engineer Troops by Thomas Lincoln Casey, February 21, 1874

Concrete Beams Broken, undated [December 1881]

Congress of the United States - House Resolution, March 5, 1880

Congressional Record re: Library of Congress Building

Congressional request, undated [January 1892]

Copy of Endorsements by [S. V. Benet, J.J. Laidley], June 30, 1882

Corporal O'Neill to Thomas Lincoln Casey, July 25, 1894

Corps of Cadets, September 1875

Corps of Engineers, Special Orders, November 29, 1886

Cost of heating Apparatus in Public Buildings, undated [1893]

Cottrell & Bryer to John H. Caswell May 15, 1865

Court of Claims, Albert B. Mullett v. The United States, May 4, 1889

Creamer to Thomas Lincoln Casey, October 29, 1895

Cross Section of Strata under Monument, undated

Cubic feet of Marble, undated

D. B. Culberson to Thomas Lincoln Casey, February 11, 1893, telegram

D. C. Houston to Thomas Lincoln Casey, January 26, 1889

D. C. Houston to Thomas Lincoln Casey, May 21, 1892

D. Gardiner Tyler to Thomas Lincoln Casey, April 13, 1894

D. Garrison to Thomas Lincoln Casey, April 18, 1876

D. H. Remington to Thomas Lincoln Casey, July 12, 1893

D. H. Remington to Thomas Lincoln Casey, June 30, 1893

D. M. Rhodes to [an unknown cousin], May 6, 1880

Colonel A. A. Humphreys to Thomas Lincoln Casey, April 20, 1870

Colonel A. Piper to Thomas Lincoln Casey, September 30, 1878

Colonel Asa Bird Gardner to Thomas Lincoln Casey, April 13, 1875

Colonel Benet to Thomas Lincoln Casey, December 1875

Colonel Bleddyn Powell to Thomas Lincoln Casey, April 11, 1894

Colonel C. Seaforth Stewart to Thomas Lincoln Casey, February 24, 1875

Colonel C. Seaforth Stewart to Thomas Lincoln Casey, July 6, 1868

Colonel C. Seaforth Stewart to Thomas Lincoln Casey, March 10, 1873

Colonel C. Seaforth Stewart to Thomas Lincoln Casey, March 28, 1871

Colonel C. Seaforth Stewart to Thomas Lincoln Casey, November 27, 1868

Colonel C. Seaforth Stewart to Thomas Lincoln Casey, September 18, 1868

Colonel C. Seaworth Stewart to Thomas Lincoln Casey, June 8, 1871

Colonel C. Seaworth Stewart to Thomas Lincoln Casey, May 23, 1871

Colonel C. W. Howell to Thomas Lincoln Casey, August 1, 1872

Colonel C. W. Merrill to Thomas Lincoln Casey, December 19, 1874

Colonel C. W. Merrill to Thomas Lincoln Casey, March 21, 1874

Colonel David C. Houston to Thomas Lincoln Casey, June 20, 1872

Colonel Fred Ainsworth to Thomas Lincoln Casey, November 13, 1893

Colonel Fred Ainsworth to Thomas Lincoln Casey, November 18, 1893

Colonel Fred Ainsworth to Thomas Lincoln Casey, November 16, 1893

Colonel Frederick Prime to Thomas Lincoln Casey, November 21, 1868

Colonel G. H. Mendell to Thomas Lincoln Casey, February 3, 1893

Colonel Henry Brewerton to Thomas Lincoln Casey to Thomas Lincoln Casey, May 4, 1871

Colonel Houston to Thomas Lincoln Casey, November 20, 1875

Colonel J. B. Wheeler to Thomas Lincoln Casey, April 30, 1868