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Photographic seismic recorder as illustrated in: Coming to Grips with theEarthquake Problem, by Nicholas H. Heck, 1931. Journal of the FranklinInstitute, Vol. 212, No. 3, pp. 269-303.
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Photographic seismic recorder as illustrated in: Coming to Grips with theEarthquake Problem, by Nicholas H. Heck, 1931. Journal of the FranklinInstitute, Vol. 212, No. 3, pp. 269-303.
4/3/2019 2:12:44 PM
Date:
1930 Ca.
Subject:
Geophysics Seismology
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