@misc{indiciae3212c170e209,
  title = {New maps of Federal coal},
  author = {R. G. Wayland},
  year = {1981},
  doi = {10.1130/0016-7606(1981)92<542:nmofc>2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70011938},
  note = {Source identifier: 70011938}
}