@misc{indiciae4662b6231c4e, title = {Geological Survey research 1971, Chapter C}, author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey}, year = {1971}, doi = {10.3133/pp750c}, url = {https://pubs.usgs.gov/publication/pp750C}, note = {Source identifier: pp750C} }