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Bahamas portion of Chart of Atlantic Ocean by A. Lindenkohl 1882.Showing Gulf Stream, Currents, Surface and Bottom Temperatures and Soundings.This bathymetric map details much of the work of the C&GS; Steamer BLAKE and isamong the earliest detailed maps of a continental margin. Note Puerto Rico Trench and Blake Plateau. This is perhaps the earliest correct depiction of a trench.