Instructions which must be followed by licensed officers of all United States merchant vessels traversing the submarine zone
By: Issued by the United States Shipping board. Approved by secretary of the navy, secretary of commerce, supervising inspector general, Steamboat-inspection service
Publisher: Govt. print. off.
Published: 1917
Place of publication: Washington
Language: eng
Subjects: Merchant marine; Safety measures; Submarine warfare
Notes: At head of title: United States Shipping board.

With this is bound: Suggested regulations for the protection of ships imperiled by mines or submarines ... Washington, Govt. print. off., 1917 (13 p.)