Colonel [William] P. Craighill to Thomas Lincoln Casey, March 21, 1873

Colonel [William] P. Craighill to Thomas Lincoln Casey, May 14, 1874

Colonel [William] P. Craighill to Thomas Lincoln Casey, May 26, 1875

Colonel [William] P. Craighill to Thomas Lincoln Casey, November 16, 1874

Colonel [William] P. Craighill to Thomas Lincoln Casey, November 5, 1875

Colonel [William] P. Craighill to Thomas Lincoln Casey, October 15, 1872 (1)

Colonel [William] P. Craighill to Thomas Lincoln Casey, October 15, 1872 (2)

Colonel [William] P. Craighill to Thomas Lincoln Casey, October 17, 1872

Colonel [William] P. Craighill to Thomas Lincoln Casey, October 21, 1873

Colonel [William] P. Craighill to Thomas Lincoln Casey, October 9, 1875

Colonel [William] P. Craighill to Thomas Lincoln Casey, September 28, 1875

Florida G. Casey to Thomas Lincoln Casey, February 22, 1882

Florida G. Casey to Thomas Lincoln Casey, February 7, 1882

Florida G. Casey to Thomas Lincoln Casey, July 3, 1886

Florida G. Casey to Thomas Lincoln Casey, October 22, 1894

Florida G. Casey to Thomas Lincoln Casey, October 28, 1893

Florida G. Casey to Thomas Lincoln Casey, October 30, 1894

Florida Gordon Casey to Thomas Lincoln Casey, June 26, 1888

Foundation and buttressing calculations, undated

Frances O'Reilly to Thomas Lincoln Casey, January 31, 1894

Francis B. Whitcomb to Thomas Lincoln Casey, October 23, 1895

Francis Collingwood to Thomas Lincoln Casey, February 10, 1886

Francis Collingwood to Thomas Lincoln Casey, May 20, 1886

Francis Fassenden to Thomas Lincoln Casey, November 24, 1882

Francis Fessenden to Thomas Lincoln Casey, April 5, 1872

Francis Fessenden to Thomas Lincoln Casey, August 28, 1886

Francis Fessenden to Thomas Lincoln Casey, December 8, 1886 (1)

Francis Fessenden to Thomas Lincoln Casey, December 8, 1886 (2)

Francis Fessenden to Thomas Lincoln Casey, February 29, 1892

Francis Fessenden to Thomas Lincoln Casey, February 5, 1894

Francis Fessenden to Thomas Lincoln Casey, February 6, 1882

Francis Fessenden to Thomas Lincoln Casey, June 11, 1872

Francis Fessenden to Thomas Lincoln Casey, June 15, 1872

Francis Fessenden to Thomas Lincoln Casey, June 19, 1894

Francis Fessenden to Thomas Lincoln Casey, June 8, 1893

Francis Fessenden to Thomas Lincoln Casey, May 10, 1872

Francis Fessenden to Thomas Lincoln Casey, May 18, 1872

Francis Fessenden to Thomas Lincoln Casey, May 26, 1863

Francis Fessenden to Thomas Lincoln Casey, May 28, 1895

Francis Fessendon to Thomas Lincoln Casey, March 11, 1886

Francis Miller to Thomas Lincoln Casey, October 11, 1886

Francis Winthrop Palfrey to Thomas Lincoln Casey, June 21, 1889

Frank N. Larned to Thomas Lincoln Casey, April 23, 1889

Frank Richardson to Thomas Lincoln Casey, June, 18, 1895

Frank Sturgis to Thomas Lincoln Casey, December 11, 1895

Frank W. Agnel to Thomas Lincoln Casey, January 31, 1882

Frank W. Agnel to Thomas Lincoln Casey, June 5, 1882

Frank W. Armstrong to Thomas Lincoln Casey, November 23, 1886

Franklin Allen to Thomas Lincoln Casey, January 13, 1883

Franklin Allen to Thomas Lincoln Casey, November 28, 1882