TY  - RPRT
TI  - Subsurface stratigraphy of the Heath shale and Amsden formation in central Montana
AU  - C.L. Nieschmidt
PY  - 1953
DO  - 10.3133/oc50
UR  - https://pubs.usgs.gov/publication/oc50
ID  - oc50
ER  -