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Radcliffe Tracts 47 (5)Dunn, S.
The Navigator's Guide, to the Oriental or Indian Seas: or the Description and Use of a Variation Chart of the Magnetic Needle, designed for shewing the Longitude, throughout the principal Parts of the Atlantic, Ethiopic, and Southern Oceans; within a Degree, or Sixty Miles. With an Introductory Discourse, concerning the Discovery of the Magnetic Variation, the finding of the Longitude thereby, and several useful Tables
London: Printed for the Author; and Sold by him ..., n.d.
[1934-41]
[n.d.]