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1.

図書
図書
1. Making number discoveries
by Leo J. Brueckner, Elda L. Merton, Foster E. Grossnickle
出版情報: Philadelphia : The John C. Winston, [19--]
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2.

図書
図書
2. How to make arithmetic meaningful
by Leo J. Brueckner and Foster E. Grossnickle
出版情報: (In-house reproduction)
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