The history and service record of the 140th is here:http://www.pa-roots.com/pacw/infantry/140th/140thorg.html
along with muster rolls for the companies of the 140th.
The U. S. Military History Institute’s bibliography for the 140th lists the following references:
Bell, Gregory J. "In Defense of Colonel Richard P. Roberts, Commanding Officer of the Pennsylvania 140th Regiment". MA Thesis, Marshall, 2004. 115 p. E527.5.140thB45.
Brookes, Timothy. "The Walking Artillery: Off to War With the 140th Pennsylvania Infantry." Military Images Magazine (Jan/Feb 1989): p. 23 (l photocopied page). Per.
Paxton, John R. Sword and Gown: A Memorial Volume, a Gift to his Friends. [Ed. by Calvin D. Wilson] NY: Knickerbocker, l926. 5l7 p. BL27P38. Pp. 297-401 contain Civil War reminiscences.
Pennsylvania. Gettysburg Battlefield Comm. Pennsylvania at Gettysburg: Ceremonies at the Dedication of the Monuments Erected by the Commonwealth.... Vol. 2. Hbg, PA: Wm S Ray, 1914. pp. 686-90 (3 photocopied pages). E475.53P422v2. (Addresses delivered at the dedication of the regimental monument and a photo of that monument at the Gettysburg National Military Park).
Powelson, Benjamin F. History of Company K of the 140th Regiment Pennsylvania Volunteers (1862-65). Ann Arbor, MI: Univ Microfilms, l970 reprint of 1906 ed. E527.5.140th.K68.
Stewart, Robert L. History of the One Hundred and Fortieth Regiment, Pennsylvania Volunteers. Phila: Franklin Bindery, l9l2. 504 p. E527.5.140thS74.
Walters, Sara G. Inscription at Gettysburg: In Memoriam to Captain David Acheson, Company C, 140th Pennsylvania Volunteers. Gettysburg, PA: Thomas Pubs, 1990. 174 p. E527.5.140thW34.
White, A. G. History of Co. F, l40th Regiment Pa. V. Ann Arbor, MI: Univ Microfilms, 1973 reprint of 1908 ed. 32 p. E527.5.140thW4.
Wunker, Russ. "Col. Richard Roberts, 140th Pennsylvania." North South Trader's Civil War Vol. 33, No. 3 (2008): pp. 38-41 & 62-63. Per.