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Wikipedia definition
1. Prime Tortoise of the Record BureauThe Prime Tortoise of the Record Bureau was the largest encyclopedia compiled during the Chinese Song Dynasty (960-1279 AD). It was the last of the Four Great Books of Song, the previous three encyclopedias published in the 10th century. The encyclopedia was originally named Narrative of Monarchs and Officials in the Past Dynasties but was later renamed to Yuangui, meaning the oracle tortoise shells, and Cefu, the imperial's storehouse of literature.
Read “Prime Tortoise of the Record Bureau” on English Wikipedia
Read “冊府元亀” on Japanese Wikipedia
Read “Prime Tortoise of the Record Bureau” on DBpedia

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