則Chronology

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500580600700800900960100011001200141015401600170018001900 520–579750–799910–9591010–10991290–14091420–1539

1

1

1

10 +4

1

6

1

1

1

1

4

1

3

1

2

1

2

4

1

1

1

3

2

1

1

2

1

1

1

1

2

1

7 +1

2

4

2

124 +118

2

2

5

1

14 +8

17 +11

5

12 +6

10 +4

21 +15

16 +10

2

19 +13

22 +16

1

3

3

11 +5

6

21 +15

No year recorded 705

+699

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 ↗