@misc{indiciae0c4cf6c817ec,
  title = {Land use and land cover and associated maps for Portland, Maine, New Hampshire},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/ofr7642},
  url = {https://pubs.usgs.gov/publication/ofr7642},
  note = {Source identifier: ofr7642}
}