@misc{indiciae9aaf54b8dde8,
  title = {Physical and chemical characteristics of water in coal-mine ponds, eastern Oklahoma, June to November 1977-81},
  author = {L. J. Slack and S. P. Blumer},
  year = {1984},
  doi = {10.3133/ofr84446},
  url = {https://pubs.usgs.gov/publication/ofr84446},
  note = {Source identifier: ofr84446}
}