Cost of concrete foundation for Thomas Pedestal, September 28, 1877

Cost of Courses of North Wing, 1/2 First Story, except Cent. Par. [Central Parapet?], June 20, 1877, No. 8

Cost of Gilding Dome, Lantern and Torch, November 14, 1893

Cost of Laying 2 [inch] Mains, November 20, 1876

Cost of lightning rods to Thomas Lincoln Casey, October 29, 1885

Cost of running elevator, December 1, 1885

Cost of Running Navy Building, undated

Court Yard Wall, Cubic Contents Course at Quarried Dimensions, South Wing, No. 3, undated

Cousin Ella to Thomas Lincoln Casey, August 2, 1891

Crosby S. Noyes to Thomas Lincoln Casey, undated [1879]

Crosby to Thomas Lincoln Casey, June 6, 1890

Crosby to Thomas Lincoln Casey, September 27, 1877

Cubic Contents etc., Basement & Cellar, South Wing, No. 2, undated

Cubic Contents and Cost of Public Buildings, undated [November 1889]

Cubic Contents of Courses in Basemement [Basement], Sub-Basement and Area Walls of North Wing, June 4, 1877

Cubic Contents of Stone in Basement & Cellar Walls of East Wing Courtyard, undated

Cubic Foot Cont of S. W. & N Building & Library Building, undated

Cyanotype: Constructing the Library of Congress, December 30, 1891

Cyanotype: Constructing the Library of Congress, June 16, 1891

Cyanotype: Constructing the Library of Congress, South Front, June 16, 1891

Cyanotype: December 9, 1891

Cyanotype: Ethnological Heads

D. Appleton & Co., to Thomas Lincoln Casey, April 23, 1890

D. B. Harmony to Thomas Lincoln Casey, November 15, 1890

D. B. Updike to Thomas Lincoln Casey, November 24, 1885

D. B. Updike to W. Maxwell Greene to Thomas Lincoln Casey, October 24, 1885

D. C. Atkins to Thomas Lincoln Casey, April 8, 1878

D. C. Houston to Thomas Lincoln Casey, February 15, 1887

D. C. Houston to Thomas Lincoln Casey, January 22, 1887

D. C. Houston to Thomas Lincoln Casey, January 23, 1887

D. C. Houston to Thomas Lincoln Casey, September 23, 1892

D. C. to Anderson, March 25, 1879; W. A. A. to Thomas Lincoln Casey, undated [March 1879]. 1

D. C. to Anderson, March 25, 1879; W. A. A. to Thomas Lincoln Casey, undated [March 1879]. 2

D. Goodwin to Thomas Lincoln Casey, February 7, 1884

D. H. Knapp to Thomas Lincoln Casey, January 20, 1891

D. Haskins, Jr. to Thomas Lincoln Casey, July 19, 1888

D. J. Jones, Esq. to Thomas Lincoln Casey, November 10, 1869

D. J. Kelly to Thomas Lincoln Casey, July 9, 1888

Capt. W. L. Marshall, U.S. Engineer Office to Thomas Lincoln Casey, March 19, 1891

Capt. W. L. Marshall, U.S. Engineer Office to Thomas Lincoln Casey, March 8, 1891

Capt. William T. Rossell to Thomas Lincoln Casey, November 13, 1890

Capt. [Illegible] to Thomas Lincoln Casey, January 13, 1891

Capt. [William] G. Tarbox to Thomas Lincoln Casey, June 7, 1890

Capt. [William] T. Rossell to Thomas Lincoln Casey, June 10, 1891

Capt. [William] T. Rossell to Thomas Lincoln Casey, October 16, 1890

Capt. [William] T. Rossell, to Thomas Lincoln Casey, March 26, 1891

Captain A. H. Burnham to Thomas Lincoln Casey, January 17, 1869

Captain C. F. Palfrey to Thomas Lincoln Casey, July 30, 1887

Captain C. W. Howell to Thomas Lincoln Casey, August 14, 1879, copy

Captain Davis to Thomas Lincoln Casey, October 16, 1879