@misc{indiciae6a91ebef7d7e,
  title = {Classification, delineation, and measurement of nonparallel folds},
  author = {J.B. Mertie},
  year = {1959},
  doi = {10.3133/pp314e},
  url = {https://pubs.usgs.gov/publication/pp314E},
  note = {Source identifier: pp314E}
}