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Heck 1939
Heck, N.H. (1939). Magnetic work of the United States Coast and Geodetic Survey, April 1938 to March 1939. Transactions, American Geophysical Union 20: doi: 10.1029/TR020i003p00392. issn: 0002-8606.
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Transactions, American Geophysical Union
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American Geophysical Union
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