@misc{indiciae6f6b41ec1a92,
  title = {Resources for the 21st century; summary and conclusions of the International Centennial Symposium of the U.S. Geological Survey},
  author = {Frank C. Whitmore},
  year = {1981},
  doi = {10.3133/cir857},
  url = {https://pubs.usgs.gov/publication/cir857},
  note = {Source identifier: cir857}
}