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Contour map of Gulf of Mexico as sounded by the C&GS; Steamer BLAKEbetween 1873 and 1875. Over 3,000 soundings went into this chart, most of thedeep water soundings beween taken by the Sigsbee Sounding Machine. This was thefirst realistic bathymetric map of any oceanic basin. In: Three Cruises ofthe BLAKE by Alexander Agassiz, 1888. P. 102. QH 93.A26 1888 v.1.