@misc{indiciaee015fff948e8,
  title = {Fur productivity of submarginal farmland},
  author = {Francis M. Uhler and L. M. Llewellyn},
  year = {1952},
  doi = {10.2307/3797183},
  url = {https://pubs.usgs.gov/publication/5220056},
  note = {Source identifier: 5220056}
}