TY  - RPRT
TI  - Selected annotated bibliography on asphalt-bearing rocks of the United States and Canada, to 1970
AU  - Marjorie C. Mullens
AU  - Albert Eugene Roberts
PY  - 1972
DO  - 10.3133/b1352
UR  - https://pubs.usgs.gov/publication/b1352
ID  - b1352
ER  -