@misc{indiciae3d2441fb7fa9,
  title = {A preurbanization reconnaissance study of Lake Earl, Del Norte County, California},
  author = {E. J. Helley and R. C. Averett},
  year = {1972},
  doi = {10.3133/ofr72162},
  url = {https://pubs.usgs.gov/publication/ofr72162},
  note = {Source identifier: ofr72162}
}