TY  - RPRT
TI  - New maps of Federal coal
AU  - R. G. Wayland
PY  - 1981
DO  - 10.1130/0016-7606(1981)92<542:nmofc>2.0.co;2
UR  - https://pubs.usgs.gov/publication/70011938
ID  - 70011938
ER  -