@misc{indiciaedc5689237e5b,
  title = {Terrestrial Ecosystems - Land Surface Forms of the Conterminous United States},
  author = {Jill J. Cress and Roger G. Sayre and Patrick Comer and Harumi Warner},
  year = {2009},
  doi = {10.3133/sim3085},
  url = {https://pubs.usgs.gov/publication/sim3085},
  note = {Source identifier: sim3085}
}