@misc{indiciae7bca9db8a270,
  title = {Terrestrial ecosystems: Surficial lithology of the conterminous United States},
  author = {Jill Cress and David Soller and Roger G. Sayre and Patrick Comer and Harumi Warner},
  year = {2010},
  doi = {10.3133/sim3126},
  url = {https://pubs.usgs.gov/publication/sim3126},
  note = {Source identifier: sim3126}
}