闢Chronology

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6708309001000112015401660177018001940 680–829840–899910–9991010–11191160–15391550–16591690–17691850–1939

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No year recorded 4

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 ↗