What has the author Paul R Schratz written?

Paul R. Schratz has written:
'Submarine commander' -- subject(s): United States, Submarine, American Personal narratives, World War, 1939-1945, Naval operations, United States. Navy, Biography, Korean War, 1950-1953
'The reminiscences of Captain Paul Richard Schratz, U.S. Navy (retired)' -- subject(s): Biography, History, Naval, Naval History, Submarine captains, Submarine forces, United States, United States. Navy