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Heck 1931
Heck, N.H. (1931). Observations of developments in instruments at the Seismological Research Laboratory in Pasadena. Transactions, American Geophysical Union 12: doi: 10.1029/TR012i001p00078-1. issn: 0002-8606.
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Transactions, American Geophysical Union
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American Geophysical Union
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