@misc{indiciaeffcd4cc3fa93,
  title = {Monitoring cyclical changes in U.S. metals activity},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1998},
  doi = {10.3133/fs07198},
  url = {https://pubs.usgs.gov/publication/fs07198},
  note = {Source identifier: fs07198}
}