SWALLOW, George Clinton (1817-1899). Geological Report of the Country Along the Line of the South-Western Branch of the Pacific Railroad, State of Missouri. St. Louis, 1859. 8vo (229 x 150 mm). Folding chromolithographic map, 2 lithographic plates after R. B. Price. (Some light spotting.) Publisher's brown cloth (spine slightly sunned, a few light stains, extremities just rubbed). FIRST EDITION, describing the topography and geology along the Southwest Branch of the Pacific Railroad. The map, entitled "Geological Map of South-West Branch, Pacific Railroad" includes a distance table to points along the route from St. Louis. Graff 4043 (lacking map and plates); Sabin 49594.