@misc{indiciaefab5c7d47244,
  title = {Detecting a coal/shale interface},
  author = {Broussard, P. H. and Burch, J. L. and Campbell, R. A. and Drost, E. J. and Hudgins, J. L. and Morris, P. W. and Reid, H., Jr. and Stein, R. J. and Zimmerman, J. E.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800000061},
  note = {Source identifier: 19800000061}
}