4th page of "Some Morphological Results of the Cruise of the "METEOR"
January to May 1938" by Gunther Dietrich. Published in International Hydrograph
ic Review 1939. This article clearly establishes Gunther Dietrich as the first
to note the median valley of the Mid-Atlantic Ridge. Pp. 52-55. Dietrich here
describes the parallel undulations marching off the crest of the main ridge.