@misc{indiciaebde4e5526f67,
  title = {Rubidium-strontium dating of the trondhjemite of Rio Brazos, New Mexico and of the Kroenke Granodiorite, Colorado},
  author = {Fred Barker and Z. E. Peterman and W.T. Henderson and R.E. Hildreth},
  year = {1974},
  url = {https://pubs.usgs.gov/publication/70156516},
  note = {Source identifier: 70156516}
}