1.

図書
図書
1. Preparatory mathematics for elementary teachers
[by] Ralph Crouch, George Baldwin [and] Robert J. Wisner
出版情報: New York : J. Wiley, [1965]
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2.

図書
図書
2. The structure of abstract algebra
[by] Ralph B. Crouch [and] David N. Beckman
出版情報: [Glenview, Ill.] : Scott, Foresman, [1970]
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