@misc{indiciae6831052b61f3,
  title = {Progress report on taxonomic and stratigraphic study of macrofossils, 1947},
  author = {George Gryc},
  year = {1954},
  doi = {10.3133/ofr54105},
  url = {https://pubs.usgs.gov/publication/ofr54105},
  note = {Source identifier: ofr54105}
}