@misc{indiciae6f1088ae20f7, title = {Water resources data fro Pennsylvania; Volume 1, Delaware River basin, water year 1976}, author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey}, year = {1977}, doi = {10.3133/wdrpa761}, url = {https://pubs.usgs.gov/publication/wdrPA761}, note = {Source identifier: wdrPA761} }