@misc{indiciae630191ca9419,
  title = {Maps showing bottom sediments on the Continental Shelf of the northeastern United States – Cape Ann, Massachusetts to Casco Bay, Maine},
  author = {D. W. Folger and C. J. O’Hara and James M. Robb},
  year = {1975},
  doi = {10.3133/i839},
  url = {https://pubs.usgs.gov/publication/i839},
  note = {Source identifier: i839}
}