@misc{indiciae427ed66878ab,
  title = {U.S. Geological Survey Library Classification System},
  author = {R. Scott Sasscer},
  year = {1990},
  doi = {10.3133/ofr90526},
  url = {https://pubs.usgs.gov/publication/ofr90526},
  note = {Source identifier: ofr90526}
}