"Isoseismal map of the earthquake of March 9, 1937. Roman numerals indicate intensities on the Wood-Neumann Scale" (MM Scale).
A Macrosiesmic Study of the Ohio Earthquakes of March, 1937, A.J. Westland, S.J. and Ross R. Heinrich - Bulletin of the Seismological Society of America, Vol. 30, no.3, fig. 3, pp 251 - 260. July, 1940.
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