@misc{indiciae7064541af7a2,
  title = {Mapping extent and change in surface mines within the United States for 2001 to 2006},
  author = {Christopher E. Soulard and William Acevedo and Stephen V. Stehman and Owen P. Parker},
  year = {2015},
  doi = {10.1002/ldr.2412},
  url = {https://pubs.usgs.gov/publication/70156877},
  note = {Source identifier: 70156877}
}