@misc{indiciaefc61aab219d0,
  title = {Geology and Rb-Sr age of Precambrian W Puritan Quartz Monzonite, northern Michigan},
  author = {P.K. Sims and Zell E. Peterman and W. C. Prinz},
  year = {1977},
  url = {https://pubs.usgs.gov/publication/70233051},
  note = {Source identifier: 70233051}
}