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The first map demonstrating the continuity of the Mid-Atlantic Ridge median rift valley as published in: The Floors of the Oceans. I. The North Atlantic, byBruce C. Heezen, Marie Tharp, and Maurice Ewing. 1959. Plate 20.NOAA Central Library Call No. G83. H43 1959. Vol. 1. (Image credit: Archival Photography by Steve Nicklas)