TY  - RPRT
TI  - Stability of highwalls in surface coal mines, western Powder Ridge Basin, Wyoming and Montana
AU  - Fitzhugh T. Lee
AU  - William K. Smith
AU  - William Z. Savage
PY  - 1976
DO  - 10.3133/ofr76846
UR  - https://pubs.usgs.gov/publication/ofr76846
ID  - ofr76846
ER  -