Translations of the earliest documents describing the principal methods used to find longitude at sea
Andrews, W.J.H.; Murshel (1996). Translations of the earliest documents describing the principal methods used to find longitude at sea, in: Andrewes, W.J.H. (Ed.) The quest for longitude: The Proceedings of the Longitude Symposium Harvard University, Cambridge, Massachusetts November 4-6, 1993. pp. 376-392
In: Andrewes, W.J.H. (Ed.) (1996). The quest for longitude: The Proceedings of the Longitude Symposium Harvard University, Cambridge, Massachusetts November 4-6, 1993. Collection of Historical Scientific Instruments, Harvard University: Cambridge. ISBN 0-9644329-0-0. 437 pp., meer
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