@misc{indiciaedc94734b430b,
  title = {U.S. Geological Survey heavy metals program progress report 1968 - Field studies},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/cir621},
  url = {https://pubs.usgs.gov/publication/cir621},
  note = {Source identifier: cir621}
}