@misc{indiciae8015bfc8f899,
  title = {Geologic map of the eastern parts of the Belvidere and Portland quadrangles, Warren County, New Jersey},
  author = {Avery A. Drake and R.L. Kastelic and P. T. Lyttle},
  year = {1985},
  doi = {10.3133/i1530},
  url = {https://pubs.usgs.gov/publication/i1530},
  note = {Source identifier: i1530}
}