German submarine mail of World War I
By: Bernard A. Hennig.
Contributors: Germany Philatelic Society.
Series: GPS library booklet series ;; no. 10
Publisher: Germany Philatelic Society
Published: 1991
Place of publication: Chicago, IL (5944 W. Montrose, Chicago 60634)
Language: eng
Number of pages: 125
Subjects: Submarine mail -- Germany -- History.; World War, 1914-1918 -- Postal service -- History.
Notes: Includes bibliographical references (p. 125).