乎Chronology

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51061070080090010001100120015401600174018001940 520–609750–799840–899910–9991010–10991290–15391670–17391890–1939

1

5

1

2

1

1

1

3

1

1

1

1

1

2

5

1

1

1

1

1

1

1

2

3

1

9 +3

2

5

3

4

No year recorded 73

+67

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 ↗