兩Chronology

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500580600670700800970100011001200154016001940 520–579620–669840–9691010–10991290–15391670–1939

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1

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3

5

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1

1

1

2

2

1

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4

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1

1

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2

1

No year recorded 8

+2

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 ↗