@misc{indiciae7b7ede6e5328,
  title = {Geochemical Survey of Missouri: Plans and progress for sixth six-month period (January-June 1972)},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1972},
  doi = {10.3133/ofr72403},
  url = {https://pubs.usgs.gov/publication/ofr72403},
  note = {Source identifier: ofr72403}
}