@misc{indiciae7fcf07deee02,
  title = {Use of chemistry and stable sulfur isotopes to determine sources of trends in sulfate of Colorado lakes},
  author = {J.T. Turk and K. Campbell and N.E. Spahr},
  year = {1993},
  doi = {10.1007/bf00478156},
  url = {https://pubs.usgs.gov/publication/70018249},
  note = {Source identifier: 70018249}
}