@misc{indiciae420ffe3be091,
  title = {DLGGSM : a program to load data from 1:24,000- scale and 1:100,000-scale topographic maps stored in the Digital Line Graph-3 (optional) format into a GSMAP data base, Part A - Documentation},
  author = {Gary I. Selner and Gregory N. Green},
  year = {1990},
  doi = {10.3133/ofr90459a},
  url = {https://pubs.usgs.gov/publication/ofr90459A},
  note = {Source identifier: ofr90459A}
}