Alex T. Stewart to Thomas Lincoln Casey, September 7, 1859

Alex. R. Boteler to Robert Mills, June 5, 1848

Alexander & Speyers to Thomas Lincoln Casey, March 10, 1894

Alexander MacKenzie to Thomas Lincoln Casey, February 13, 1895

Alexander MacKenzie to Thomas Lincoln Casey, February 2, 1895

Alexander MacKenzie to Thomas Lincoln Casey, January 16, 1895

Alexander MacKenzie to Thomas Lincoln Casey, January 20, 1895

Alexander MacKenzie to Thomas Lincoln Casey, January 25, 1895 (1)

Alexander MacKenzie to Thomas Lincoln Casey, January 25, 1895 (2)

Alexander Ramsey to Thomas Lincoln Casey, undated [1880]

Alexander Williams to Thomas Lincoln Casey, July 6, 1894

Alfred C. Harmer to Thomas Lincoln Casey, October 12, 1886

Alfred de Claparede to Thomas Lincoln Casey, November 9, 1893

Alfred Noble to Thomas Lincoln Casey, February 6, 1895 (1)

Alfred Noble to Thomas Lincoln Casey, February 6, 1895 (2)

Alfred P. Trantwein to Thomas Lincoln Casey, March 13, 1882

Alfred P. Trautwein to Thomas Lincoln Casey, March 10, 1881

Alfred P. Trautwein to Thomas Lincoln Casey, March 7, 1881

Alice Potter to [Elizabeth Goodale Casey Scott], undated [January 1881]

Alice W. Babcock to Thomas Lincoln Casey, April 30, 1886

Alice W. Babcock to Thomas Lincoln Casey, December 1, 1882

Alice W. Babcock to Thomas Lincoln Casey, December 27, 1882

Alice W. Babcock to Thomas Lincoln Casey, February 27, 1886

Alice W. Babcock to Thomas Lincoln Casey, June 2, 1886

Alice W. Babcock to Thomas Lincoln Casey, March 31, 1886

Allan Rutherford to Thomas Lincoln Casey, February 24, 1875

Allan Rutherford to Thomas Lincoln Casey, July 6, 1874

Allan Rutherford to Thomas Lincoln Casey, November 25, 1871

Allan Rutherford, Treasury Department E. A. Paul, Chief Engineer Division, February 1873, circular

Allen Arnold to Thomas Lincoln Casey, April 8, 1889

Alston G. Dayton, U. S. Representative from West Virginia to Thomas Lincoln Casey, April 2, 1895

Alston G. Dayton, U. S. Representative from West Virginia to Thomas Lincoln Casey, April 2, 1895.

Alvan Southworth to Thomas Lincoln Casey, March 15, 1875

Alvan Southworth to Thomas Lincoln Casey, March 31, 1875

Alvey A. Adee to Thomas Lincoln Casey, April 11, 1886

Alvey A. Adee to Thomas Lincoln Casey, January 12, 1880

Amasa M. Eaton to Thomas Lincoln Casey, July 10, 1894

Ambrose E. Burnside to Thomas Lincoln Casey, May 20, 1880

Amelia J. Rowland to Thomas Lincoln Casey, April 7, 1880

Amelia J. Rowland to Thomas Lincoln Casey, June 24, 1880

Amelia J. Rowland to Thomas Lincoln Casey, March 2, 1881

Amelia J. Rowland to Thomas Lincoln Casey, March 3, 1880

Amelia Waite to Thomas Lincoln Casey, May 10, 1889

American Geographical Society to Thomas Lincoln Casey, December 23, 1886

American Home Missionary Society to Thomas Lincoln Casey, June 17, 1858

American Society of Civil Engineers to Thomas Lincoln Casey, March 15, 1881, invitation

American Society of Civil Engineers, March 30, 1882, circulars

American Society of Engineers to Thomas Lincoln Casey, December 1, 1882, bill

Amos Perry to Thomas Lincoln Casey, October 24, 1882

Amos Stickley to Thomas Lincoln Casey, October 12, 1868