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Google圖書搜尋
A Comparison of the Performance of Elementary School Pupils of 1958-1959 and 1980-1981 on Selected Tumbling and Balance Stunts
Rex Stuart Davis
出版
University of Idaho
, 1982
URL
http://books.google.com.hk/books?id=0zQ6OAAACAAJ&hl=&source=gbs_api