@misc{indiciae33ddab36c760,
  title = {Laboratory hydraulic calibration of the Helley-Smith bedload sediment sampler},
  author = {Leroy Druffel and W. W. Emmett and V.R. Schneider and J. V. Skinner},
  year = {1976},
  doi = {10.3133/ofr76752},
  url = {https://pubs.usgs.gov/publication/ofr76752},
  note = {Source identifier: ofr76752}
}