Cobb’s arithmetical rules and tables, designed for the use of small children in families and schools, 660 - Chandler Collection no. 8, Volume: Archives Chandler Collection no. 8. Clarion University Archives.

Cobb’s arithmetical rules and tables, designed for the use of small children in families and schools, 660 - Chandler Collection no. 8, Volume: Archives Chandler Collection no. 8. Clarion University Archives. http://as-clarion.klnpa.org/repositories/2/resources/989 Accessed December 24, 2025.