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Detailed Reference Information
Knapp 1942
Knapp, D.G. (1942). Methods used in the production of the 1940 isogonic chart of the United States. Transactions, American Geophysical Union 23: doi: 10.1029/TR023i002p00294. issn: 0002-8606.
Journal
Transactions, American Geophysical Union
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American Geophysical Union
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