@misc{indiciaedf4cb7d5164d,
  title = {An approach to automated longwall mining},
  author = {Palowitch, E. R. and Broussard, P. H., Jr.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790041858},
  note = {Source identifier: 19790041858}
}