@misc{indiciae400682dc009a,
  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 = {1980},
  doi = {10.3133/ha616},
  url = {https://pubs.usgs.gov/publication/ha616},
  note = {Source identifier: ha616}
}