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Google圖書搜尋
An Investigation on the Value of Drill Work in the Fundamental Operations of Arithmetic
Anna Lucene Campbell
Bertha M. Boody
Charles Gillette Burd
Emily Thorp Burr
Herbert Austin Brown
Joseph Clifton Brown
Mabel Frances Brooks
Margaret Theresa Bulson
May Brownlee
Samuel Burkhard
出版
1912
URL
http://books.google.com.hk/books?id=x_jIugEACAAJ&hl=&source=gbs_api