TY  - RPRT
TI  - Digital maps and figures on CD-ROM for Mineral and energy resource assessment of the Helena National Forest, west-central Montana
AU  - Gregory N. Green
AU  - Russell G. Tysdal
PY  - 1997
DO  - 10.3133/ofr96683b
UR  - https://pubs.usgs.gov/publication/ofr96683B
ID  - ofr96683B
ER  -