TY  - RPRT
TI  - Miscellaneous analyses of coal samples from various fields of the United States
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1913
DO  - 10.3133/b531m
UR  - https://pubs.usgs.gov/publication/b531M
ID  - b531M
ER  -