@misc{indiciae412778f63337,
  title = {Pilot studies for the North American Soil Geochemical Landscapes Project - Site selection, sampling protocols, analytical methods, and quality control protocols},
  author = {D. B. Smith and L. G. Woodruff and R. M. O’Leary and W.F. Cannon and R. G. Garrett and J.E. Kilburn and M. B. Goldhaber},
  year = {2009},
  doi = {10.1016/j.apgeochem.2009.04.008},
  url = {https://pubs.usgs.gov/publication/70036827},
  note = {Source identifier: 70036827}
}