@misc{indiciaeab56f1893519,
  title = {A plane-type soil sampler},
  author = {Paul J. Frey},
  year = {1963},
  doi = {10.1577/1548-8659(1963)25[46:apss]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70171209},
  note = {Source identifier: 70171209}
}