@misc{indiciaec81e03f2653e,
  title = {Instructions for use of BM-54 and BM-60 bed-material samplers for the collection of samples to be analyzed for organic substances},
  author = {V.C. Colby},
  year = {1965},
  url = {https://pubs.usgs.gov/publication/70170549},
  note = {Source identifier: 70170549}
}