Arndt, H. H. (1973). Geologic map of the Mount Carmel quadrangle, Columbia, Northumberland, and Schuylkill Counties, Pennsylvania. U.S. Geological Survey.
Chicago Style (17th ed.) CitationArndt, Harold H. Geologic Map of the Mount Carmel Quadrangle, Columbia, Northumberland, and Schuylkill Counties, Pennsylvania. Washington, D.C.: U.S. Geological Survey, 1973.
MLA (9th ed.) CitationArndt, Harold H. Geologic Map of the Mount Carmel Quadrangle, Columbia, Northumberland, and Schuylkill Counties, Pennsylvania. U.S. Geological Survey, 1973.
Warning: These citations may not always be 100% accurate.