Sevallon A. Brown to Thomas Lincoln Casey, July 25, 1879

Sewer at D St & N. J. Av, and [William] J. Twining to Thomas Lincoln Casey, January 21, 1880

Sewers empty into the Potomac, undated [1877]

Sid Casey to Thomas Lincoln Casey, November 9, 1888

Sidney S. Rider to Thomas Lincoln Casey, December 31, 1883

Sidney S. Rider to Thomas Lincoln Casey, February 15, 1896

Sidney S. Rider to Thomas Lincoln Casey, February 26, 1884

Sidney S. Rider to Thomas Lincoln Casey, June 18, 1890

Sidney S. Rider to Thomas Lincoln Casey, March 4, 1896

Sidney S. Rider to Thomas Lincoln Casey, March 6, 1896

Sidney S. Rider to Thomas Lincoln Casey, March 9, 1896

Sidney S. Rider to Thomas Lincoln Casey, November 11, 1887

Sidney S. Rider to Thomas Lincoln Casey, November 3, 1892

Silas Casey to Thomas Lincoln Casey, August 3, 1891

Silas Casey to Thomas Lincoln Casey, July 19, 1891

Silas Casey to Thomas Lincoln Casey, September 29, 1891

Simon Newcourt to Thomas Lincoln Casey, June 3, 1879

Sketch: Clock for Alcoves, Reading Room, undated

Sketch: Main Entrance Openings, First Story West Main, undated

Sketch: Seating plan for a meal, undated

Smith S. Leach to Thomas Lincoln Casey, December 17, 1892

Thomas Greene to Thomas Lincoln Casey, February 2, 1885

Thomas Greene to Thomas Lincoln Casey, July 11, 1888

Thomas Greene to Thomas Lincoln Casey, May 6, 1887

Thomas Greene to Thomas Lincoln Casey, September 11, 1883

Thomas Harvey to Thomas Lincoln Casey, December 24, 1869 (1)

Thomas Harvey to Thomas Lincoln Casey, December 24, 1869 (2)

Thomas Harvey to Thomas Lincoln Casey, December 31, 1869

Thomas Harvey to Thomas Lincoln Casey, January 3, 1869

Thomas Harvey to Thomas Lincoln Casey, November 16, 1869

Thomas Harvey to Thomas Lincoln Casey, November 9, 1869

Thomas Harvey to Thomas Lincoln Casey, October 16, 1869 (1)

Thomas Harvey to Thomas Lincoln Casey, October 16, 1869 (2)

Thomas Harvey to Thomas Lincoln Casey, October 5, 1869 (1)

Thomas Harvey to Thomas Lincoln Casey, October 5, 1869 (2)

Thomas J. Gould to Thomas Lincoln Casey, December 15, 1883

Thomas J. Gould to Thomas Lincoln Casey, February 10, 1883

Thomas J. Gould to Thomas Lincoln Casey, November 14, 1888

Thomas J. Gould to Thomas Lincoln Casey, November 21, 1887

Thomas J. Gould to Thomas Lincoln Casey, October 20, 1884

Thomas J. Gould to Thomas Lincoln Casey, September 20, 1884

Thomas J. Peirce to Thomas Lincoln Casey, March 21, 1885

Thomas L. Gould to Thomas Lincoln Casey, January 23, 1885

Thomas Lincoln Casey - Water levels in January 1871, undated

Thomas Lincoln Casey - Notes made at Buffalo, June 14, 1887

Thomas Lincoln Casey Calculations - Cellar, basement, sub-basement stone measurements, undated [1882-1884]

Thomas Lincoln Casey Calculations - North and West Wings, undated [1882-1884]

Thomas Lincoln Casey draft of letter to Secretary of War, Stephen Benton Elkins, August 12, 1892

Thomas Lincoln Casey drafts, undated [August 1892]

Thomas Lincoln Casey Jr. Report, January 18, 1879