@misc{indiciaed523f6f9e908,
  title = {User's guide for GSREF; a personal computer bibliographic reference system; version 3.1},
  author = {G.I. Selner},
  year = {1986},
  doi = {10.3133/ofr86186},
  url = {https://pubs.usgs.gov/publication/ofr86186},
  note = {Source identifier: ofr86186}
}