@misc{indiciaef871283bd935,
  title = {GSDRAW and GSMAP system version 6.0 : graphics programs and utility programs for the IBM PC and compatible microcomputers, to assist compilation and publication of geologic maps and illustrations, Part A - Documentation and tutorial},
  author = {Gary I. Selner and Richard B. Taylor},
  year = {1989},
  doi = {10.3133/ofr89373a},
  url = {https://pubs.usgs.gov/publication/ofr89373A},
  note = {Source identifier: ofr89373A}
}