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H.M.S. CHALLENGER, at St. Vincent. & H.M. Troop Ship SIMOON leaving fore theGold Coast, with Marines, July 30, 1873 from the CHALLENGER SKETCHBOOK byB. Shepard. This work was discovered by J. Welles Henderson, abenefactor of the Philadelphia Maritime Museum. Accompanying text by Harris B.Stewart, oceanographer and marine science historian, then head of NOAA AOML.