規Chronology

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6107401000110015901660173018001900 620–739750–9991010–10991160–15891600–16591670–1729

1

1

1

1

1

1

1

1

1

1

5

3

1

2

2

1

1

8 +2

6

1

No year recorded 41

+35

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 ↗