@misc{indiciae6cf2c6eab059,
  title = {The Effect of Selected Cleaning Techniques on Berkshire Lee Marble: A Scientific Study at Philadelphia City Hall},
  author = {Victor G. Mossotti and A. Raouf Eldeeb and Terry L. Fries and Mary Jane Coombs and Virginia N. Naude and Lisa Soderberg and George S. Wheeler},
  year = {2002},
  doi = {10.3133/pp1635},
  url = {https://pubs.usgs.gov/publication/pp1635},
  note = {Source identifier: pp1635}
}