@misc{indiciaedbef996b8cfb,
  title = {Map showing availability of ground water in the Connecticut River lowlands, Massachusetts},
  author = {Eugene H. Walker and William W. Caswell},
  year = {1977},
  doi = {10.3133/ha563},
  url = {https://pubs.usgs.gov/publication/ha563},
  note = {Source identifier: ha563}
}