TY  - RPRT
TI  - Geochemical survey of the western coal regions second annual progress report, July 1975
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1975
DO  - 10.3133/ofr75436
UR  - https://pubs.usgs.gov/publication/ofr75436
ID  - ofr75436
ER  -