| 1.
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図書
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edited by Clarence L. Barnhart, Robert K. Barnhart ; prepared in cooperation with World Book, Inc
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| 2.
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図書
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edited by Clarence L. Barnhart ; with the assistance of 355 authorities and specialists
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| 3.
図書 |
図書
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edited by Clarence L. Barnhart ; with the assistance of 355 authorities and specialists
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| 4.
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図書
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by E.L. Thorndike & Clarence L. Barnhart
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