1. The Conterminous United States mineral appraisal program : background information to accompany folio of geologic, geochemical, geophysical, and mineral resource maps of the Choteau 1 ̊x 2 ̊quadrangle, Montana Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, Geological Survey, 1981 Resource Type: Book Access & Availability: Loading