渠Chronology

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5005806707308009009701000111012001540160017701800 510–579590–669680–729740–799810–899910–9691010–11091290–15391670–1769

1

1

1

3

1

2

1

1

1

3

2

1

1

1

1

1

1

3

8 +2

4

5

1

No year recorded 21

+15

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 ↗