伴Chronology

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610730800900970100011001230141015401600170018001900 620–729740–799810–899910–9691010–10991160–12291290–14091420–1539

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2

2

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

6

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1

3

4

5

1

1

2

1

No year recorded 56

+50

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 ↗