@misc{indiciae778505229722,
  title = {Study results of 9 sites used by off-road vehicles that illustrate land modifications},
  author = {Howard Gordon Wilshire},
  year = {1977},
  doi = {10.3133/ofr77601},
  url = {https://pubs.usgs.gov/publication/ofr77601},
  note = {Source identifier: ofr77601}
}