@misc{indiciaef54ae7bfb8d3,
  title = {List of current and planned projects of the trace elements program, U.S. Geological Survey},
  author = {Rollin C. Vickers},
  year = {1951},
  doi = {10.3133/tei201},
  url = {https://pubs.usgs.gov/publication/tei201},
  note = {Source identifier: tei201}
}