Manual of information and suggestions for object lessons, in a course of elementary instruction / by Marcius Willson., 660 - Chandler Collection no. 63, Volumes: Archives Chandler Collection no. 63. Clarion University Archives.

Manual of information and suggestions for object lessons, in a course of elementary instruction / by Marcius Willson., 660 - Chandler Collection no. 63, Volumes: Archives Chandler Collection no. 63. Clarion University Archives. http://as-clarion.klnpa.org/repositories/2/resources/1044 Accessed December 20, 2025.