TY  - RPRT
TI  - Stratigraphy of Mid-Cretaceous Blackleaf and lower part of the Frontier formations in parts of Beaverhead and Madison counties, Montana
AU  - T. S. Dyman
AU  - D. J. Nichols
PY  - 1988
DO  - 10.3133/b1773
UR  - https://pubs.usgs.gov/publication/b1773
ID  - b1773
ER  -