@misc{indiciae49d8dd648373,
  title = {U.S. Geological Survey collaboration with international authors, 1987-1998},
  author = {Valentina Markusova and Hearn},
  year = {2000},
  doi = {10.3133/ofr00131},
  url = {https://pubs.usgs.gov/publication/ofr00131},
  note = {Source identifier: ofr00131}
}