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1
由 Neulen, Leon Nelson, 1894-
New York City : Teachers College, Columbia University, 1931
主題:
“...Arithmetic Study and teaching....”New York City : Teachers College, Columbia University, 1931
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2
由 Kramer, Grace Amanda, 1877-
Baltimore, The Johns Hopkins press, 1933
主題:
“...Arithmetic Problems, exercises, etc....”Baltimore, The Johns Hopkins press, 1933
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Thesis
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3
由 Klaf, A. Albert
New York, Dover Publications 1964
主題:
“...Arithmetic Problems, exercises, etc....”New York, Dover Publications 1964
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4
由 Schubert, Hermann, 1848-1911
Berlin u. Leipzig : W. De Gruyter & co., 1926
4. neubearb. und erweiterte aufl.,
主題:
“...Arithmetic Problems, exercises, etc....”Berlin u. Leipzig : W. De Gruyter & co., 1926
4. neubearb. und erweiterte aufl.,
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