Williams, D. R., Sams, J. I., & Clark, M. E. (1996). Effects of coal-mine discharges on the quality of the Stonycreek River and its tributaries, Somerset and Cambria counties, Pennsylvania. U.S. Geological Survey.
Chicago Style (17th ed.) CitationWilliams, Donald R., James I. Sams, and Mary E. Clark. Effects of Coal-mine Discharges on the Quality of the Stonycreek River and Its Tributaries, Somerset and Cambria Counties, Pennsylvania. Lemoyne, Pennsylvania: U.S. Geological Survey, 1996.
MLA (9th ed.) CitationWilliams, Donald R., et al. Effects of Coal-mine Discharges on the Quality of the Stonycreek River and Its Tributaries, Somerset and Cambria Counties, Pennsylvania. U.S. Geological Survey, 1996.
Warning: These citations may not always be 100% accurate.