He is known for a number of notable scholarly works, including the 310-volume ''[[Honcho tsugan|Honchô tsugan]]'', begun by Razan and completed by Gahô in [[1670]]; the ''[[Kan'ei shoka keizuden]]'' ("Genealogies of the Houses of the Kan'ei Era"), on which he worked alongside his father in [[1641]]-[[1643]]<ref>Mary Elizabeth Berry, ''Japan in Print''. University of California Press, 2006. pp113-115.; "[http://kotobank.jp/word/%E5%AF%9B%E6%B0%B8%E8%AB%B8%E5%AE%B6%E7%B3%BB%E5%9B%B3%E4%BC%9D Kan'ei shoka keizuden]." ''Digital Daijisen''. Shogakukan, Inc.</ref>; the preface to the ''[[Honcho gashi|Honchô gashi]]'' ("History of Paintings of the Realm")<ref>"[http://www.aisf.or.jp/~jaanus/deta/h/honchougashi.htm Honchou Gashi]." ''JAANUS: Japan Architecture and Art Net Users System''. 2001. Accessed 30 December 2011.</ref>; and ''[[Ka'i hentai]]'', a work on foreign peoples and foreign relations, begun in [[1674]]. | He is known for a number of notable scholarly works, including the 310-volume ''[[Honcho tsugan|Honchô tsugan]]'', begun by Razan and completed by Gahô in [[1670]]; the ''[[Kan'ei shoka keizuden]]'' ("Genealogies of the Houses of the Kan'ei Era"), on which he worked alongside his father in [[1641]]-[[1643]]<ref>Mary Elizabeth Berry, ''Japan in Print''. University of California Press, 2006. pp113-115.; "[http://kotobank.jp/word/%E5%AF%9B%E6%B0%B8%E8%AB%B8%E5%AE%B6%E7%B3%BB%E5%9B%B3%E4%BC%9D Kan'ei shoka keizuden]." ''Digital Daijisen''. Shogakukan, Inc.</ref>; the preface to the ''[[Honcho gashi|Honchô gashi]]'' ("History of Paintings of the Realm")<ref>"[http://www.aisf.or.jp/~jaanus/deta/h/honchougashi.htm Honchou Gashi]." ''JAANUS: Japan Architecture and Art Net Users System''. 2001. Accessed 30 December 2011.</ref>; and ''[[Ka'i hentai]]'', a work on foreign peoples and foreign relations, begun in [[1674]]. |