Map showing “Known Earthquakes of the United States”. In: “Coming to grips with the Earthquake Problem,” by Nicholas H. Heck, 1931. Journal of the Franklin Institute, Vol. 212, No. 3, pp. 269-303.
Photo Category: Geophysics Seismology
Photo Date: 1930 Ca.
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| Added On | 16th October 2015 |
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