TY - RPRT TI - Geochemical variation in a copper-bearing redbed sequence of the Ravalli Group (Belt Supergroup), northwestern Montana and northern Idaho; Part B, Geochemical data AU - Jon J. Connor PY - 1991 DO - 10.3133/ofr9128b UR - https://pubs.usgs.gov/publication/ofr9128B ID - ofr9128B ER -