@misc{indiciae28b0c1f4b179,
  title = {Map of southeastern Maine showing heavy metals in stream sediments},
  author = {Edwin V. Post and William L. Lehmbeck and William H. Dennen and Gary A. Nowlan},
  year = {1967},
  doi = {10.3133/mf301},
  url = {https://pubs.usgs.gov/publication/mf301},
  note = {Source identifier: mf301}
}