@misc{indiciaef0b7397bb8cc,
  title = {Indiana oolitic limestone: Relation of its natural features to its commercial grading},
  author = {G. F. Loughlin},
  year = {1930},
  doi = {10.3133/b811c},
  url = {https://pubs.usgs.gov/publication/b811C},
  note = {Source identifier: b811C}
}