@misc{indiciae7456426bd6c1,
  title = {Chemical analyses of coal from the Mesa Verde Formation, Grand Mesa coal field, Delta and Mesa counties, Colorado},
  author = {Ronald H. Affolter and George P. Eager and Joseph R. Hatch},
  year = {1980},
  doi = {10.3133/ofr80980},
  url = {https://pubs.usgs.gov/publication/ofr80980},
  note = {Source identifier: ofr80980}
}