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H.M.S. CHALLENGER, on her way to St. Paul Rocks, Agst 1873 from theCHALLENGER SKETCHBOOK by B. Shepard. This work was discovered byJ. Welles Henderson, a benefactor of the Philadelphia MaritimeMuseum. Accompanying text by Harris B. Stewart, then head of NOAA'sAtlantic Oceanographic and Meteorological Laboratories. (Image credit: Philadelphia Maritime Museum)