TY  - RPRT
TI  - Map showing contours on top of the upper Cretaceous Mowry Shale, Powder River basin, Wyoming and Montana
AU  - B.L. Crysdale
PY  - 1991
DO  - 10.3133/mf2140d
UR  - https://pubs.usgs.gov/publication/mf2140D
ID  - mf2140D
ER  -