@misc{indiciaec783652f7cf4,
  title = {Notes on the greensand deposits of the eastern United States},
  author = {G. H. Ashley},
  year = {1918},
  doi = {10.3133/b660b},
  url = {https://pubs.usgs.gov/publication/b660B},
  note = {Source identifier: b660B}
}