MAXWELL, ROSS A. - The Big Bend of the Rio Grande. A guide to the rocks, geologic history, and settlers of the area of Big Bend National Park.

1968, repr. 1971. Bur. Econ. Geol. Univ. Texas Austin Guidebook 7; 138 pp. 117 fig./phot. (3 fold. in pocket), 2 fold. maps in pocket incl. large col. geol. map 1:62,500. Orig. wrps. minor traces of use only, contents very good.