... Ray’s new Higher arithmetic; a revised ed. of the Higher arithmetic, 660 - Chandler Collection no. 20, Volume: Archives Chandler Collection no. 20. Clarion University Archives.

... Ray’s new Higher arithmetic; a revised ed. of the Higher arithmetic, 660 - Chandler Collection no. 20, Volume: Archives Chandler Collection no. 20. Clarion University Archives. http://as-clarion.klnpa.org/repositories/2/resources/1000 Accessed December 23, 2025.