@misc{indiciae5d14301e0d55,
  title = {Transcontinental geophysical survey (35°-39° N) radiometric age determinations of rocks},
  author = {R. R. Marvin},
  year = {1968},
  doi = {10.3133/i537},
  url = {https://pubs.usgs.gov/publication/i537},
  note = {Source identifier: i537}
}