@misc{indiciaee9fe40ed87e6,
  title = {Hydrology and water resources of the lower Merrimack River basin, Massachusetts, from Concord River, Lowell, to Plum Island, Newburyport},
  author = {Frederick B. Gay and David F. Delaney},
  year = {1979},
  doi = {10.3133/ofr79557},
  url = {https://pubs.usgs.gov/publication/ofr79557},
  note = {Source identifier: ofr79557}
}