@misc{indiciaebc179556b7f5,
  title = {Ruggles feldspar-mica mine, Grafton County, New Hampshire},
  author = {J.J. Page and E. Ellingwood and F.H. Main},
  year = {1945},
  doi = {10.3133/ofr4582},
  url = {https://pubs.usgs.gov/publication/ofr4582},
  note = {Source identifier: ofr4582}
}