TY  - RPRT
TI  - Bentonite deposits of the northern Black Hills district, Montana, Wyoming, and South Dakota
AU  - M. M. Knechtel
AU  - S. H. Patterson
PY  - 1955
DO  - 10.3133/mf36
UR  - https://pubs.usgs.gov/publication/mf36
ID  - mf36
ER  -