@misc{indiciaea15c2e50613a,
  title = {North Carolina mica mines},
  author = {J. C. Olson and L.W. Seegers and J.W. Parker and L. Goldthwait and J. W. Parker and V.C. Fryklund and W. R. Griffitts and L.A. Norman and W.C. Stoll and R.J. Jahns and W. P. Irwin and Paul Lancaster and M. R. Klepper and E. W. Heinrich and L.C. Pray and D.W. Larrabee and R.A. Swanson and W.B. Allen and J.J. Page and E. Ellingwood and J.R. Wolfe and R. W. Lemke and R. Miller},
  year = {1944},
  doi = {10.3133/ofr4471},
  url = {https://pubs.usgs.gov/publication/ofr4471},
  note = {Source identifier: ofr4471}
}