1. Intellectual arithmetic : upon the inductive method of instruction / by Warren Colburn, A.M. Nineteenth Century Collections Online: Children's Literature and Childhood. Colburn, Warren, 1793-1833 Bellows-Falls, Vermont : J.I. Cutler ; Boston : Hilliard, Gray, Little and Wilkins, 1829. Book Online
2. An intellectual arithmetic : with an introduction to written arithmetic / by Geo. A. Walton, A.M., and Electa N.L. Walton, authors of "Written arithmetic," "Pictorial primary arithmetic," "Dictation exercises in arithmetic," etc. Walton, George A. (George Augustus), 1822-1908. Waltons' normal series, Nineteenth Century Collections Online: Children's Literature and Childhood., Walton's normal series Walton, George A. (George Augustus), 1822-1908 Boston : Brewer and Tileston, [1869]©1869 Book Online