@misc{indiciaeea79298f20f5,
  title = {Clean air protection problems at national parks and wilderness areas : hearing before the Environment, Energy, and Natural Resources Subcommittee of the Committee on Government Operations, House of Representatives, One Hundred Third Congress, second session, April 29, 1994 — Illustration, BHL page 16603796},
  year = {1995},
  url = {https://www.biodiversitylibrary.org/page/16603796},
  note = {Source identifier: page-16603796}
}