TY  - RPRT
TI  - Mineral and energy resource assessment of the Helena National Forest, west-central Montana
AU  - Russell G. Tysdal
AU  - S. D. Ludington
AU  - Anne E. McCafferty
PY  - 1996
DO  - 10.3133/ofr96683a
UR  - https://pubs.usgs.gov/publication/ofr96683A
ID  - ofr96683A
ER  -