@misc{indiciae311292c0e0c5,
  title = {Representation of ecological systems within the protected areas network of the continental United States},
  author = {Jocelyn L. Aycrigg and Anne Davidson and Leona K. Svancara and Kevin J. Gergely and Alexa McKerrow and J. Michael Scott},
  year = {2013},
  doi = {10.1371/journal.pone.0054689},
  url = {https://pubs.usgs.gov/publication/70044671},
  note = {Source identifier: 70044671}
}