Number by development
Subtitle: a method of number instruction...
By: By John C. Gray...
Publisher: J.B. Lippincott company
Published: 1910
Place of publication: Philadelphia; London
Language: eng
Subjects: Arithmetic -- Study and teaching
Table of contents: title: [v. 1] Primary.; title: v. 2. Intermediate grades.; title: v. 3. Grammar grades.