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The magnetic atlas, or Variation charts of the whole terraqueous globe comprising a system of the variation & dip of the needle by which the observations being truly made, the longitude may be ascertained. By John Churchman, Fellow of the Russian Imperial Academy.

Bibliographic Details
Main Author: Churchman, John, 1753-1805.
Corporate Author: Eighteenth Century Collections Online
Format: Online Book
Published: New-York : Printed for the author, and sold by Gaine & Ten Eyck, no. 148, Pearl-Street, 1800.
Edition:The third edition with additions.
Online Access:Full text online
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