帝Chronology

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51058060070080090010001100120014101620171018001900 520–579840–899910–9991010–10991230–14091420–16191660–1709

1

2

2

1

3

1

1

1

1

2

1

3

1

1

3

3

2

1

1

1

1

1

20 +14

19 +13

2

47 +41

2

4

13 +7

6

7 +1

3

1

3

1

3

18 +12

8 +2

7 +1

2

3

No year recorded 176

+170

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 ↗