TY  - RPRT
TI  - Vertical-Control Subsystem for Automatic Coal Mining
AU  - Griffiths, W. R.
AU  - Smirlock, M.
AU  - Aplin, J.
AU  - Fish, R. B.
AU  - Fish, D.
PY  - 1984
UR  - https://ntrs.nasa.gov/citations/19830000659
ID  - 19830000659
ER  -