Robert Todd Lincoln to Thomas Lincoln Casey, July 14, 1882

Robert W. Lamb to Thomas Lincoln Casey, July 12, 1881

Robert W. Watson to Thomas Lincoln Casey, July 21, 1895

Robert W. Watson to Thomas Lincoln Casey, September 1, 1893

Robert W. Weir to Emma Weir Casey, August 26, 1865

Robert W. Weir to Emma Weir Casey, February 8, 1882

Robert W. Weir to Thomas Lincoln Casey, February 11, 1872

Robert W. Weir to Thomas Lincoln Casey, February 9, 1873

Robert W. Weir to Thomas Lincoln Casey, January 18, 1872

Robert W. Weir to Thomas Lincoln Casey, January 28, 1882

Robert W. Weir to Thomas Lincoln Casey, July 15, 1861

Robert W. Weir to Thomas Lincoln Casey, June 13, 1863

Robert W. Weir to Thomas Lincoln Casey, June 18, 1861

Robert W. Weir to Thomas Lincoln Casey, May 24, 1875

Robert W. Weir to Thomas Lincoln Casey, October 20, 1878

Robert W. Weir to Thomas Lincoln Casey, September 29, 1893

Robert W. Weir, Jr. to Thomas Lincoln Casey, October 23, 1893

Robert W. Weir, Jr. to Thomas Lincoln Casey, September 28, 1878

Robert Wallis to Thomas Lincoln Casey, December 15, 1855

Robert Wallis to Thomas Lincoln Casey, November 12, 1855

Robert Weir to Emma Casey, August 15, 1886

Robert Weir to Thomas Lincoln Casey, April 17, 1895

Robert Weir to Thomas Lincoln Casey, August 10, 1883

Robert Weir to Thomas Lincoln Casey, August 3, 1886

Robert Weir to Thomas Lincoln Casey, May 16, 1892

Robert Weir to Thomas Lincoln Casey, September 29, 1886

Robert Winthrop to Thomas Lincoln Casey, June 28, 1881

Robert Winthrop to Thomas Lincoln Casey, June 6, 1889

Thomas Lincoln Casey to Rufus E. Lester, February 5, 1892, copy of telegram

Thomas Lincoln Casey - Accounts, March 7, 1882

Thomas Lincoln Casey - Angle calculations and sketches, undated

Thomas Lincoln Casey - Calculations, January 20, 1878

Thomas Lincoln Casey - Calculations, undated

Thomas Lincoln Casey - Copy of Inventory and Appraisement of Estate of General Silas Casey, March 6, 1882

Thomas Lincoln Casey - Crane calculations, sketch, undated (1)

Thomas Lincoln Casey - Crane calculations, sketch, undated (2)

Thomas Lincoln Casey - Crane calculations, sketch, undated (3)

Thomas Lincoln Casey - Crane calculations, sketch, undated (4)

Thomas Lincoln Casey - Crane calculations, sketch, undated (5)

Thomas Lincoln Casey - Estimations, undated

Thomas Lincoln Casey - Math Notes, undated

Thomas Lincoln Casey - Math Notes, undated (2)

Thomas Lincoln Casey - Memorandum concerning Washington Monument Colunade, undated

Thomas Lincoln Casey - Memorandum concerning Washington Monument, undated

Thomas Lincoln Casey - Memorandum of Clay, undated

Thomas Lincoln Casey - Monument height notes, undated

Thomas Lincoln Casey - Notes concerning the extension of the dam at Great Falls, February 11, 1882

Thomas Lincoln Casey - Notes, calculations, undated (1)

Thomas Lincoln Casey - Notes, calculations, undated (2)

Thomas Lincoln Casey - Notes, undated