@misc{indiciae8123f9308566,
  title = {The Venericardia planicosta group in the Gulf province},
  author = {Julia Gardner and Edgar Bowles},
  year = {1939},
  doi = {10.3133/pp189f},
  url = {https://pubs.usgs.gov/publication/pp189F},
  note = {Source identifier: pp189F}
}