@misc{indiciaebbc11227e552,
  title = {GSGGRD; a utility program for the IBM PC and compatible microcomputers to generate geodetic grids in GSMAP format},
  author = {G.I. Selner and R. B. Taylor},
  year = {1989},
  doi = {10.3133/ofr89636},
  url = {https://pubs.usgs.gov/publication/ofr89636},
  note = {Source identifier: ofr89636}
}