The perihelion dates in the past appearances are printed on Catalog of Cometary Orbits 1996.
The identification between C/1742 C1 and C/1907 G1 is published in The orbits of the comets of short period; Popular Astronomy, Vol. 36, p.274; Pickering, W. H.
The identification between C/1742 C1 and C/1907 G1 is published in "Suisei wo Ou" by Hideo Hirose, Kiichiro Furukawa, Hiroki Kosai (Chijin-Shokan, 1971).
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