@misc{indiciae471c4a0d8dd5,
  title = {Lower Llandovery of the northern Appalachians and adjacent regions},
  author = {William G. Ayrton and William B. N. Berry and Arthur J. Boucot and Jean Lajoie and Pierre J. Lesperance and Louis Pavlides and W. Brian Skidmore},
  year = {1969},
  doi = {10.1130/0016-7606(1969)80[459:llotna]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70225066},
  note = {Source identifier: 70225066}
}