Normal mental arithmetic: a thorough and complete course by analysis and induction, 660 - Chandler Collection no. 9, Volume: Archives Chandler Collection no. 9. Clarion University Archives.

Normal mental arithmetic: a thorough and complete course by analysis and induction, 660 - Chandler Collection no. 9, Volume: Archives Chandler Collection no. 9. Clarion University Archives. http://as-clarion.klnpa.org/repositories/2/resources/990 Accessed December 23, 2025.