@misc{indiciae6023f389c306,
  title = {A rapid method for concentrating sedimentary organic matter for vitrinite reflectance analysis},
  author = {C.E. Barker},
  year = {1982},
  doi = {10.1306/212f7fef-2b24-11d7-8648000102c1865d},
  url = {https://pubs.usgs.gov/publication/70011656},
  note = {Source identifier: 70011656}
}