David H. Miller and Mark J. Stegmaier, James F. Milligan: His Journal of Fremont's Fifth Expedition, 1853-1854; His Adventurous Life on Land and Sea, Arthur H. Clark Co., 1988. 300 pp.
NY Times, Harper's Weekly political cartoon, "That's What's the Trouble with John C."; Fremont's 1864 challenge to Lincoln's re-nomination.