@misc{indiciae6065d6bb8332,
  title = {Palynological contribution to geologic mapping of coal-bearing upper Paleocene rocks in the lower Indus coal region, Pakistan},
  author = {N. O. Frederiksen},
  year = {1990},
  doi = {10.3133/ofr90243},
  url = {https://pubs.usgs.gov/publication/ofr90243},
  note = {Source identifier: ofr90243}
}