操Chronology

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7401110168017701860 750–11091120–16791690–17691780–1859

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1

1

4

1

1

No year recorded 38

+32

Each crop stands at the decade of the first year its book's date gives; a date given only as before a year stands at that year. Dates come from the catalogues and editions cited with each record. The bars draw the whole span and their counts to scale; in the strip below them, fifty years or more with no crop are folded and marked. Japanese dates converted with HuTime ↗