TY  - RPRT
TI  - A life-cycle description of underground coal mining
AU  - Lavin, M. L.
AU  - Borden, C. S.
AU  - Duda, J. R.
PY  - 1978
UR  - https://ntrs.nasa.gov/citations/19780020643
ID  - 19780020643
ER  -