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4th page of Some Morphological Results of the Cruise of the METEORJanuary to May 1938 by Gunther Dietrich. Published in International Hydrographic Review 1939. This article clearly establishes Gunther Dietrich as the firstto note the median valley of the Mid-Atlantic Ridge. Pp. 52-55. Dietrich heredescribes the parallel undulations marching off the crest of the main ridge. (Image credit: NOAA Central Library Historical Collection)