@misc{indiciae439b11bba6f1,
  title = {Geologic map of the Newark 1 degree by 2 degrees Quadrangle, New Jersey, Pennsylvania, and New York},
  author = {P. T. Lyttle and J. B. Epstein},
  year = {1987},
  doi = {10.3133/i1715},
  url = {https://pubs.usgs.gov/publication/i1715},
  note = {Source identifier: i1715}
}