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 [Albert] G. Porter to Thomas Lincoln Casey, June 4, 1879 [Albert] G. Porter to Thomas Lincoln Casey, May 20, 1880 [Albert] G. Porter to Thomas Lincoln Casey, May 6, 1879 [Albert] G. Porter to Thomas Lincoln Casey, May 8, 1879 [Albert] G. Porter to Thomas Lincoln Casey, October 27, 1879 [Alexander] Mackenzie to Thomas Lincoln Casey, August 12, 1888 [Alexander] MacKenzie to Thomas Lincoln Casey, July 31, 1889 [Alexander] Mackenzie to Thomas Lincoln Casey, March 23, 1890 [Alexander] Mackenzie to Thomas Lincoln Casey, October 4, 1892 N. Tilney to Thomas Lincoln Casey, July 27, 1869 N. W. Mason to Thomas Lincoln Casey, January 22, 1891 N. W. Mason to Thomas Lincoln Casey, January 24, 1891 Nathaniel Silsbee to Thomas Lincoln Casey, April 1, 1885 National Academy of Sciences to Thomas Lincoln Casey, April 19, 1890 National Academy of Sciences to Thomas Lincoln Casey, October 13, 1890