@misc{indiciae082d8849a842,
  title = {Visual accumulation tube for size analysis of sands},
  author = {B.C. Colby and R.P. Christensen},
  year = {1956},
  doi = {10.1061/jyceaj.0000025},
  url = {https://pubs.usgs.gov/publication/70047827},
  note = {Source identifier: 70047827}
}