@misc{indiciaee27980c5082f,
  title = {Contributions to the hydrology of the United States, 1930},
  author = {Nathan C. Grover},
  year = {1931},
  doi = {10.3133/wsp637},
  url = {https://pubs.usgs.gov/publication/wsp637},
  note = {Source identifier: wsp637}
}