契Chronology

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7008001110120012801410168017701800 710–799840–11091230–12791290–14091420–16791690–1769

2

1

1

1

1

3

1

1

1

1

2

9 +3

5

2

1

2

1

1

3

1

No year recorded 65

+59

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 ↗