@misc{indiciae8ec3dc36f4cb,
  title = {Radiogenic strontium-87 as an index of geologic processes},
  author = {C. E. Hedge and F.G. Walthall},
  year = {1963},
  doi = {10.1126/science.140.3572.1214.b},
  url = {https://pubs.usgs.gov/publication/70010716},
  note = {Source identifier: 70010716}
}