北Chronology

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50058060067070080090096010001100120015401650170018001900 510–579620–669750–799840–899910–9591010–10991210–15391600–1649

1

2

2

2

1

1

1

3

3

1

1

2

1

1

1

1

2

2

1

1

1

15 +9

3

1

36 +30

3

4

15 +9

3

1

4

63 +57

12 +6

7 +1

4

21 +15

1

6

7 +1

21 +15

30 +24

2

1

5

2

No year recorded 512

+506

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 ↗