TY  - RPRT
TI  - Minor and trace elements in coal: a selected bibliography of reports in English, January 1976
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1976
DO  - 10.3133/ofr76481
UR  - https://pubs.usgs.gov/publication/ofr76481
ID  - ofr76481
ER  -