Geological Survey of Pennsylvania, Pittsburgh Geological Society, & Shultz, C. H. (1999). The geology of Pennsylvania. Pennsylvania Geological Survey ; Pittsburgh Geological Society.
Chicago Style (17th ed.) CitationGeological Survey of Pennsylvania, Pittsburgh Geological Society, and Charles H. Shultz. The Geology of Pennsylvania. Harrisburg, Pa. : Pittsburgh, Pa.: Pennsylvania Geological Survey ; Pittsburgh Geological Society, 1999.
MLA (9th ed.) CitationGeological Survey of Pennsylvania, et al. The Geology of Pennsylvania. Pennsylvania Geological Survey ; Pittsburgh Geological Society, 1999.
Warning: These citations may not always be 100% accurate.