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The Fundamental Operations in Bead Arithmetic
Tak Ming Kwa
其他書名
How to Use the Chinese Abacus. Ying Wen Chu Suan Chih Nan
出版[publisher not identified] San Francisco, distributed by Jun Jun Company, 1941
URLhttp://books.google.com.hk/books?id=Ow0gAQAAIAAJ&hl=&source=gbs_api