"Sumner's method"
Subtitle: for finding a ship's position
By: Condensed and improved by Rev. G.M. Searle ...
Series: Van Nostrand science series -- no. 124; Van Nostrand's science series -- no. 124.
Publisher: D. Van Nostrand company
Published: 1910
Place of publication: New York
Language: eng
Number of pages: 51
Subjects: Sumner's method