Dewey Decimal Classification
デューイ十進分類法
DDC
Books in the United States
Comparison of Dewey and Library of Congress subject classification
Decimal book section numbering
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Dewey Decimal Classification
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Dewey Decimal Classification
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Dewey Decimal Classification
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Dewey Decimal Classification
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Dewey Decimal Classification
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Dewey Decimal Classification
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Dewey Decimal Classification