TY - RPRT TI - Altered volcanic ash partings in Wasatch Formation coal beds of the northern Powder River basin: composition and geologic applications AU - Bruce Forbes Bohor AU - Richard E. Phillips AU - Richard M. Pollastro PY - 1979 DO - 10.3133/ofr791203 UR - https://pubs.usgs.gov/publication/ofr791203 ID - ofr791203 ER -