@misc{indiciae332300da3a9c,
  title = {Bedrock geologic map of the Worcester South quadrangle, Worcester County, Massachusetts},
  author = {Gregory J. Walsh and Arthur J. Merschat},
  year = {2015},
  doi = {10.3133/sim3345},
  url = {https://pubs.usgs.gov/publication/sim3345},
  note = {Source identifier: sim3345}
}