@misc{indiciae89f40034da4b,
  title = {Astrogeologic studies, semiannual progress report, February 26, 1961 to August 24, 1961},
  author = {R.J. Hackman},
  year = {1962},
  doi = {10.3133/ofr62140},
  url = {https://pubs.usgs.gov/publication/ofr62140},
  note = {Source identifier: ofr62140}
}