@misc{indiciae0b40dce2fef5,
  title = {System dynamics simulation modeling applied to western coal development environmental impact analysis},
  author = {R. K. Mark and D. S. Harwood and E. B. Newman and Richard R. Doell},
  year = {1979},
  doi = {10.3133/ofr79226},
  url = {https://pubs.usgs.gov/publication/ofr79226},
  note = {Source identifier: ofr79226}
}