Astronomical navigation tables.
Series: Air publication; 1618
Publisher: H. M. Stationery Off.
Published: 1941
Place of publication: [London
Language: eng
Subjects: Navigation -- Tables.
Notes: Cover title.
At head of title: For official use only (vol. Q: Restricted)
Pub. also by the U.S. Govt. Print. Off. as U.S. Hydrographic Office. Publication no. 218.