@misc{indiciae4e10ec215df2,
  title = {Understanding natural systems; a perspective for land-use planning in Appalachian Kentucky},
  author = {Wayne L. Newell},
  year = {1978},
  doi = {10.3133/b1438},
  url = {https://pubs.usgs.gov/publication/b1438},
  note = {Source identifier: b1438}
}