@misc{indiciae8b98bf47d208,
  title = {Potential water power in the United States},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1939},
  doi = {10.3133/ofr399},
  url = {https://pubs.usgs.gov/publication/ofr399},
  note = {Source identifier: ofr399}
}