Ashburner, C. A., & Geological Survey of Pennsylvania. (1882). Western middle coal field. Geological Survey of Pennsylvania, Julius Bien & Co.).
Chicago Style (17th ed.) CitationAshburner, Charles A., and Geological Survey of Pennsylvania. Western Middle Coal Field. [Harrisburg, Pa.]: Geological Survey of Pennsylvania, Julius Bien & Co.), 1882.
MLA (8th ed.) CitationAshburner, Charles A., and Geological Survey of Pennsylvania. Western Middle Coal Field. Geological Survey of Pennsylvania, Julius Bien & Co.), 1882.
Warning: These citations may not always be 100% accurate.