科Chronology

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710830100011001620170018001900 720–829840–9991010–10991160–1619

1

2

1

1

1

1

1

1

3

3

13 +7

4

1

27 +21

1

4

4

9 +3

1

2

14 +8

3

7 +1

4

1

7 +1

No year recorded 47

+41

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 ↗