@misc{indiciae2480af08c8a8,
  title = {Our changing continent},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/70039574},
  url = {https://pubs.usgs.gov/publication/70039574},
  note = {Source identifier: 70039574}
}