@misc{indiciae880d7e836cee,
  title = {Ambient noise levels in the continental United States},
  author = {D.E. McNamara and R.P. Buland},
  year = {2004},
  doi = {10.1785/012003001},
  url = {https://pubs.usgs.gov/publication/70026920},
  note = {Source identifier: 70026920}
}