TY  - RPRT
TI  - Coal resource occurrence and coal development potential maps of the Helper Quadrangle, Carbon County, Utah
AU  - AAA Engineering and Drafting Inc.
PY  - 1979
DO  - 10.3133/ofr79148
UR  - https://pubs.usgs.gov/publication/ofr79148
ID  - ofr79148
ER  -