APA (7th ed.) Citation

Trexler, J. P., & Wood, G. H. (1968). Geologic map of the Valley View quadrangle, Schuylkill and Northumberland Counties, Pennsylvania. Geological Survey.

Chicago Style (17th ed.) Citation

Trexler, J. Peter, and Gordon H. Wood. Geologic Map of the Valley View Quadrangle, Schuylkill and Northumberland Counties, Pennsylvania. Washington: Geological Survey, 1968.

MLA (9th ed.) Citation

Trexler, J. Peter, and Gordon H. Wood. Geologic Map of the Valley View Quadrangle, Schuylkill and Northumberland Counties, Pennsylvania. Geological Survey, 1968.