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61070097011001670170018001900 750–969980–10991200–1669

4

1

1

3

1

1

1

1

1

1

40 +34

6

1

3

2

4

1

3

1

1

3

4

5

9 +3

3

2

3

No year recorded 95

+89

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 ↗