@misc{indiciae3e26643b915d,
  title = {Graphical aids for estimating general scour in long channel contractions},
  author = {Carl F. Nordin},
  year = {1977},
  doi = {10.3133/ofr77837},
  url = {https://pubs.usgs.gov/publication/ofr77837},
  note = {Source identifier: ofr77837}
}