TY  - RPRT
TI  - Natural Bitumen Resources of the United States
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 2006
DO  - 10.3133/fs20063133
UR  - https://pubs.usgs.gov/publication/fs20063133
ID  - fs20063133
ER  -