TY  - RPRT
TI  - Lithologic studies of fine-grained Upper Cretaceous sedimentary rocks of the Black Hills region
AU  - W.W. Rubey
PY  - 1931
DO  - 10.3133/pp165a
UR  - https://pubs.usgs.gov/publication/pp165A
ID  - pp165A
ER  -