@misc{indiciae5ff1a8ee0c46,
  title = {Geochemical Survey of Missouri: Plans and progress for fourth six-month period (January-June 1971)},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1971},
  doi = {10.3133/ofr72401},
  url = {https://pubs.usgs.gov/publication/ofr72401},
  note = {Source identifier: ofr72401}
}