@misc{indiciae6ffcef68853d,
  title = {Recent gastropod boreholes and Ordovician cylindrical borings},
  author = {M.R. Carriker and E. L. Yochelson},
  year = {1968},
  doi = {10.3133/pp593b},
  url = {https://pubs.usgs.gov/publication/pp593B},
  note = {Source identifier: pp593B}
}