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- Title
- A new and accurate method of finding a ship's position at sea, by projection on Mercator's chart ... The principles of the method being fully explained and illustrated by problems, examples, and plates, with rules for practice, and examples from actual observation. By Capt. Thomas H. Sumner.
- Author
- Sumner, Thomas H.
- Publication info
- Boston, T. Groom & co.,
- 1851.