William N. Sweet to Thomas Lincoln Casey, December 3, 1883

William N. Sweet to Thomas Lincoln Casey, November 18, 1892

William P. Craighill to Capt. [Thomas] Turtle, June 22, 1891

William P. Craighill to Major [Henry M.] Adams, June 26, 1891

William P. Craighill to Thomas Lincoln Casey, copy, November 7, 1892

William P. Craighill to Thomas Lincoln Casey, February 20, 1885

William P. Craighill to Thomas Lincoln Casey, July 2, 1891

William P. Craighill to Thomas Lincoln Casey, July 20, 1885

William P. Craighill to Thomas Lincoln Casey, July 9, 1891

William P. Craighill to Thomas Lincoln Casey, May 22, 1891; Bixby to Craighill, May 21, 1891

William P. Duvall to Thomas Lincoln Casey, June 15, 1885

William P. Frye to Thomas Lincoln Casey, February 28, 1891, telegram

William P. Frye to Thomas Lincoln Casey, March 28, 1888

William Palmer Hopkins to Thomas Lincoln Casey, June 22, 1885

William Palmer Hopkins to Thomas Lincoln Casey, June 28, 1885

William R. Babcock to Thomas Lincoln Casey, February 4, 1885

William R. Babcock to Thomas Lincoln Casey, October 1, 1884

William R. Davis to Thomas Lincoln Casey, undated [1877]

William Richardson to Thomas Lincoln Casey, April 7, 1885

William Rossell to Thomas Lincoln Casey, October 27, 1891

William Tindall to Thomas Lincoln Casey, February 3, 1885 (1)

William Tindall to Thomas Lincoln Casey, February 3, 1885 (2)

William Tindall to Thomas Lincoln Casey, February 4, 1885

William Whelan to Thomas Lincoln Casey, October 16, 1869

William [Tecumseh] Sherman to the Keeper - Washington Aquaduct, May 22, 1878, telegram

Willliam Cabell to Thomas Lincoln Casey, February 18, 1885

Wilson Vance and [Augustus] Watson to Thomas Lincoln Casey, June 12, 1879

Wimer to Dr. Barnard, November 29, 1877

Wolf Class to Thomas Lincoln Casey, November 7, 1888

Women's Christian Association to Thomas Lincoln Casey, April 6, 1878

Woodbury Pulsifer to Thomas Lincoln Casey, January 23, 1890

Woodbury Pulsifer to Thomas Lincoln Casey, January 29, 1890

Work by Edward Pearce Casey - Statement of services rendered, undated

Work by Edward Pearce Casey - Summaries and Totals, undated

Work by Edward Pearce Casey - Tablet Inscription Required, undated

Work by Edward Pearce Casey - Uncompleted and Future Work, undated

Wright to Thomas Lincoln Casey, undated [January 1879] (1)

Wright to Thomas Lincoln Casey, undated[January 1879] (2)

[A.] A. Humphrey to Thomas Lincoln Casey, January 11, 1878

[Admiral] Silas Casey to Thomas Lincoln Casey, January 25, 1890

[Admiral] Silas [Casey] to Thomas Lincoln Casey, April 29, 1890

[Admiral] Silas [Casey] to Thomas Lincoln Casey, August 27, 1890

[Admiral] Silas [Casey] to Thomas Lincoln Casey, July 20, 1890

[Admiral] Silas [Casey] to Thomas Lincoln Casey, March 1, 1890

[Admiral] Silas [Casey] to Thomas Lincoln Casey, May 13, 1890

[Adolphus] W. Greely to Thomas Lincoln Casey, July 18, 1888

[Albert] G. Porter to Thomas Lincoln Casey, April 10, 1880

[Albert] G. Porter to Thomas Lincoln Casey, April 11, 1879

[Albert] G. Porter to Thomas Lincoln Casey, February 13, 1879

W. S. Nason to Thomas Lincoln Casey, March 7, 1885