Hughes Granite and Marble Company Records, Rutherford B. Hayes Presidential Center [LH-252]
http://www.rbhayes.org/mssfind/lh_coll/hughesgm.htm

Hughes Granite and Marble Company Records, Vermont Historical Society Library
http://vermonthistory.org/arccat/findaid/hughesgr.htm

Ohio Civil War Monuments:

Bigger, David Dwight. Ohio's Silver Tongued Orator: Life and Speeches of General William H. Gibson. Dayton, OH: United Brethren Publishing House, 1901.

Cunningham, D. and W. W. Miller. Ohio At Antietam. Report of the Ohio Antietam Commission. Springfield, OH: [Ohio Antietam Commission], 1904.

Gault, William P. Ohio At Vicksburg. Report of the Ohio Vicksburg Battlefield Commission. Columbus, OH: [Vicksburg Battlefield Commission], 1906.

Lindsey, T. J. Ohio At Shiloh. Report of the Commission. Cincinnati, OH: C. J. Krehbiel & Co., 1903.

McElroy, Joseph H. Ohio At Chickamauga. Record of the Ohio Chickamauga and Chattanooga National Park Commission. Columbus, OH, Earhart and Richardson, 1896.

Wilder, D. S. Report of the Ohio Andersonville Monument Commission. Clyde, OH: [Ohio Andersonville Monument Commission] , 1902.