期Chronology

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5806007008309009701000108011001220141015401600170018001900 620–699750–829840–899910–9691010–10791160–12191290–14091420–1539

1

1

1

1

1

2

1

1

1

1

1

1

1

2

2

1

1

1

1

8 +2

1

1

1

1

2

15 +9

39 +33

1

1

4

1

4

3

3

5

7 +1

10 +4

1

11 +5

7 +1

14 +8

2

No year recorded 186

+180

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 ↗