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Principal facts of the earth's magnetism and methods of determining the true meridian and the magnetic declination

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Principal facts of the earth's magnetism and methods of determining the true meridian and the magnetic declination

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Summary

At head of title: Department of Commerce. U. S. Coast and geodetic survey. E. Lester Jones, superintendent.
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Date

01/01/1919
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Source

Library of Congress
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Copyright info

Public Domain

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