Two studies in arithmetic:
A diagnostic study of efficiency in arithmetic; Teaching the number facts of addition.
By Henry Lester Smith [and] Merrill Thomas Eaton.
|Main Author:||Smith, Henry Lester, 1876-|
|Related Names:||Eaton, Merrill Thomas , joint author.|
[Bloomington] Bureau of cooperative research, Indiana university 
Arithmetic > Arithmetic / Study and teaching.
incl. 1 illus., tables, diagrs.
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