@misc{indiciae27cfdac3bb2c,
  title = {Analyses of A-horizon soil and outcrop samples from the Vermillion District, northeastern Minnesota},
  author = {D. J. Grimes and David F. Siems and H. V. Alminas},
  year = {1981},
  doi = {10.3133/ofr81999},
  url = {https://pubs.usgs.gov/publication/ofr81999},
  note = {Source identifier: ofr81999}
}