Pre-Cambrian geology of the Boyertown quadrangle, 160 - 03 - 01 - LD1017 .C8182 1959 B83, Folder: Archives LD1017 .C8182 1959 B83; Folder: Carlson Library Level 2 Main Collection QE158.B67 B8 1959. Clarion University Archives.

Pre-Cambrian geology of the Boyertown quadrangle, 160 - 03 - 01 - LD1017 .C8182 1959 B83, Folder: Archives LD1017 .C8182 1959 B83; Folder: Carlson Library Level 2 Main Collection QE158.B67 B8 1959. Clarion University Archives. http://as-clarion.klnpa.org/repositories/2/resources/612 Accessed December 23, 2025.