Hearing Before the Subcommittee of the Committee on Appropriations, United States Senate, Sixty-fifth Congress, Third Session, on H.R. 15979, a Bill Making Appropriations for Fortifications and Other Works of Defense, for the Armament Thereof, and for the Procurement of Heavy Ordnance for Trial and Service, and for Fiscal Year Ending June 30, 1920, and for Other Purposes