Walt Whitman letters, July 27, 1863-September 9, 1863

: Walt Whitman letter, Washington, D.C. to Mr. and Mrs. Samuel Badwin Haskell, July 27, 1863

: Walt Whitman letter, Washington, D.C. to Mr. And Mrs. Samuel Baldwin Haskell, August 10, 1863

: F. Mathews and William Osborn letter, Horse Heads, to Daniel Bennett, August 1, 1863; F. Mathews and William Osborn letter requesting assistance for Erastus Haskell's father to visit his son in hospital., New-York Historical Society

: Walt Whitman letter, Washington, D.C. to Samuel Baldwin Haskell, September 9, 1863

: J.M. Jansen and Erastus Haskell letter, Camp Casey, Washington D.C., to Samuel Baldwin Haskell, April 5, 1863