蓋Chronology

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500580600700800900100011001200141015401600170018001900 520–579910–9991010–10991290–14091420–1539

1

1

2

7 +1

1

6

1

1

1

1

4

3

1

1

1

1

1

1

1

2

1

1

2

2

1

1

1

1

1

2

4

10 +4

2

1

11 +5

1

1

1

1

5

21 +15

5

12 +6

16 +10

3

4

8 +2

2

1

7 +1

1

No year recorded 112

+106

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 ↗