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Google圖書搜尋
Two Studies in Arithmetic
Henry Lester Smith
Merrill Thomas Eaton
其他書名
A Diagnostic Study of Efficiency in Arithmetic ; Teaching the Numer Facts of Addition
出版
Bureau of Coperative Research
, 1939
URL
http://books.google.com.hk/books?id=cJp-wgEACAAJ&hl=&source=gbs_api
