APA (7th ed.) Citation

Arndt, H. H. (1971). Geologic map of the Ashland quadrangle, Columbia and Schuylkill counties, Pennsylvania. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Arndt, Harold H. Geologic Map of the Ashland Quadrangle, Columbia and Schuylkill Counties, Pennsylvania. Washington, D.C.: U.S. Geological Survey, 1971.

MLA (8th ed.) Citation

Arndt, Harold H. Geologic Map of the Ashland Quadrangle, Columbia and Schuylkill Counties, Pennsylvania. U.S. Geological Survey, 1971.