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Instructor's Manual for Teaching the Child Mathematics, 2nd Edition, Schminke/Maertens/Arnold
Norbert Maertens
出版Holt, Rinehart and Winston, 1978
ISBN00304145129780030414510
URLhttp://books.google.com.hk/books?id=JbLPtgAACAAJ&hl=&source=gbs_api