@misc{indiciaeb1ca7f1a6ab4,
  title = {GSMGRASS: a program to convert a GSM data base into ASCII files that can be imported directly into the Geographic Resources Analysis Support System (GRASS), Part B - Executable program disk},
  author = {Gary I. Selner and Joseph L. Plesha},
  year = {1990},
  doi = {10.3133/ofr90539b},
  url = {https://pubs.usgs.gov/publication/ofr90539B},
  note = {Source identifier: ofr90539B}
}