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.
Image ID: cgs00096, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1930 Ca. • High Resolution Photo Available
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