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Heck 1940
Heck, N.H. (1940). Magnetic work of the United States Coast and Geodetic Survey, April 1939 to March 1940. Transactions, American Geophysical Union 21: doi: 10.1029/TR021i002p00325. issn: 0002-8606.
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Transactions, American Geophysical Union
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American Geophysical Union
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