Gallery›Digital Commonwealth — Boston Public Library›Calculating Blocks -- Visual aid in teaching mathematical process to children 4 to 10 years old.
Calculating Blocks -- Visual aid in teaching mathematical process to children 4 to 10 years old.
Digital Commonwealth — Boston Public Library

Calculating Blocks -- Visual aid in teaching mathematical process to children 4 to 10 years old.

[ca. 1930–1945]

CC0 — Public Domain
Digital Commonwealth — Boston Public Library
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