@misc{indiciaea28cc5296ebe,
  title = {Water-resources activities of the U.S. Geological Survey},
  author = {D. H. Appel},
  year = {1990},
  doi = {10.3133/ofr90150},
  url = {https://pubs.usgs.gov/publication/ofr90150},
  note = {Source identifier: ofr90150}
}