@misc{indiciaee857facfedef,
  title = {Resources for the twenty-first century - Proceedings of the International centennial symposium of the United States Geological Survey, held at Reston, Virginia, October 14-19, 1979},
  author = {M.E. Williams},
  year = {1982},
  doi = {10.3133/pp1193},
  url = {https://pubs.usgs.gov/publication/pp1193},
  note = {Source identifier: pp1193}
}