@misc{indiciaebee7a3658513,
  title = {System 9. GSMAP, and other programs for the IBM PC and compatible microcomputers, to assist workers in the earth sciences},
  author = {G.I. Selner and R. B. Taylor},
  year = {1993},
  doi = {10.3133/ofr93511},
  url = {https://pubs.usgs.gov/publication/ofr93511},
  note = {Source identifier: ofr93511}
}