曲Chronology

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58060070080090011001200141015401600170018001900 750–799910–10991290–14091420–1539

2

1

1

2

1

1

1

2

1

1

1

1

1

2

2

1

2

1

1

1

1

3

1

1

1

2

9 +3

15 +9

1

2

4

5

6

6

2

3

4

4

15 +9

5

6

2

1

No year recorded 167

+161

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 ↗