Washington Aqueduct: Flow of Water in Conduit from Gt Falls to the Distributing Reservoir, February 25, 1882 Washington Aqueduct: Flow of Water in Conduit, undated Washington Aqueduct: Formula for calculating the flow of waterÂ…, May 26, 1881 Washington Gas Light Co. to Thomas Lincoln Casey, October 16, 1884 Washington Market Company vs. The Comissioners, January 1879 Washington Mont, undated [July 18, 1890] Washington Monument - Drawing of Monument, 1844 Washington Monument Levels, August 7, 1891 Washington's Birthplace, Estimate for Wooden Pile Wharf, undated [1882-1884] Water taken from the distributing reservoir, June 27 and June 28, 1881 Watkins & Lewis, December 1890 Webb C. Hayes to Thomas Lincoln Casey, April 1, 1878, telegram Webb C. Hayes to Thomas Lincoln Casey, August 5, 1877 Weight certificate, Washington Monument Drum, July 22, 1850 Weight certificate, Washington Monument Shaft, July 22, 1850 Weight of Iron Columns in Monument, undated West End Hotel, undated [1885] Western Presbyterian Church to Thomas Lincoln Casey, April 13, 1879 White & Bro. to Thomas Lincoln Casey, December 30, 1869 (1) White & Bro. to Thomas Lincoln Casey, December 30, 1869 (2) White & Brother to Thomas Lincoln Casey, October 10, 1877 Whyte & Overman to Thomas Lincoln Casey, April 30, 1884 Wilcox to Thomas Lincoln Casey, August 4, 1877 Wiliam P. Craighill to Thomas Lincoln Casey, July 20, 1887 William A. Maury to Thomas Lincoln Casey, February 4, 1885 William C. Endicott to Thomas Lincoln Casey, April 15, 1885 William C. Endicott to Thomas Lincoln Casey, August 28, 1885 William C. Endicott to Thomas Lincoln Casey, June 8, 1885 William C. Endicott to Thomas Lincoln Casey, September 12, 1885 William C. Endicott to Thomas Lincoln Casey, September 4, 1885 William Cabell to Thomas Lincoln Casey, Februray 15, 1885 William Chiswell Dabney to Thomas Lincoln Casey, May 24, 1879 William D. Washburn to Thomas Lincoln Casey, July [1892] William E. Chandler to Thomas Lincoln Casey, December 2, 1884 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