強Chronology

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510580600670700830100010801100120015901600170018001900 520–579620–669710–829840–9991010–10791290–1589

2

1

1

1

1

1

1

2

1

1

1

2

1

4

1

1

2

3

1

1

1

2

13 +7

11 +5

6

15 +9

3

2

3

13 +7

6

1

9 +3

7 +1

1

1

3

6

5

No year recorded 277

+271

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 ↗