@misc{indiciae4e8b3a2b56c4,
  title = {An optimization model for selecting training course locations, U.S. Geological Survey},
  author = {Timothy A. Cohn and William G. Baier},
  year = {1993},
  doi = {10.3133/ofr93123},
  url = {https://pubs.usgs.gov/publication/ofr93123},
  note = {Source identifier: ofr93123}
}