@misc{indiciae991a64efe2cd,
  title = {Thumper final report, ALSEP active seismic experiment},
  author = {Joel S. Watkins and James H. Whitcomb},
  year = {1968},
  doi = {10.3133/ofr68316},
  url = {https://pubs.usgs.gov/publication/ofr68316},
  note = {Source identifier: ofr68316}
}