TY  - RPRT
TI  - Geologic considerations in underground coal mining system design
AU  - Camilli, F. A.
AU  - Maynard, D. P.
AU  - Mangolds, A.
AU  - Harris, J.
PY  - 1981
UR  - https://ntrs.nasa.gov/citations/19820003643
ID  - 19820003643
ER  -