U.S. Coast Survey Relief shown by hachures. Prime meridian: Greenwich. Includes text on soundings and tides. "I no. 2." "No. 40." 1 map ; 34 x 36 cm. eng image image_map United States Coast Survey United States - Texas - DeWitt County - Cameron tex-fron 1854 1854 Preliminary survey of the entrance to the Rio Grande, Texas / topography by W.E. Greenwell ; hydrography by the party under the command of J. Wilkinson ; drng. by W.E. Greenwell ; engd. by C.A. Knight & F.W. Benner. oclc: 11145433 other: G4297.R5 1854 .U54 1854 Texas Landscape and Nature - Geography and Maps Rio Grande Estuary -- Maps ark: ark:/67531/metapth2480 http://texashistory.unt.edu/ark:/67531/metapth2480/