弱Chronology

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5106106707408301000110012001590160017001800 520–609620–669680–739750–829840–9991010–10991290–1589

1

1

1

1

1

1

2

2

1

1

1

2

1

1

4

3

6

4

2

12 +6

7 +1

1

4

6

5

2

4

2

No year recorded 34

+28

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 ↗