What has the author John Tompkins written?

G. C. Tompkins has written:

'A Compendium of the Overland Mail Company on the South Route, 1858-1861 and the Period Surrounding It' -- subject(s): History, Overland Mail Company, Postal service

'Parting Shots: Tales from the Last Days of Horse-Drawn Field Artillery in the United States Army 1938-1942 (Bioviews Series : No 10)'