@misc{indiciaeb11f008bb8c2,
  title = {Radiogenic isotopes and the Eastern Mineral Resources Program of the U.S. Geological Survey},
  author = {Robert A. Ayuso},
  year = {1998},
  doi = {10.3133/70220357},
  url = {https://pubs.usgs.gov/publication/70220357},
  note = {Source identifier: 70220357}
}