Geology and mineral resources of the Sinking Spring quadrangle, Berks and Lancaster Counties, Pennsylvania, 160 - 03 - 01 - LD1017 .C8182 1975 B83, Volume: Archives LD1017 .C8182 1975 B83; Volume: Carlson Library Level 2 Main Collection QE158.B43 M415. Clarion University Archives.
Geology and mineral resources of the Sinking Spring quadrangle, Berks and Lancaster Counties, Pennsylvania, 160 - 03 - 01 - LD1017 .C8182 1975 B83, Volume: Archives LD1017 .C8182 1975 B83; Volume: Carlson Library Level 2 Main Collection QE158.B43 M415. Clarion University Archives. http://as-clarion.klnpa.org/repositories/2/resources/644 Accessed December 23, 2025.
