永井家北郷家幕下成功之一巻奥書写（永井文書）

北郷次右衛門･北郷九郎兵衛連署御書付写（永井文書）

ADEAC: A System of Digitalization and Exhibition for Archive Collections

永井家文書

ADEAC: A System of Digitalization and Exhibition for Archive Collections

竹下珠丹書写奥書

ADEAC: A System of Digitalization and Exhibition for Archive Collections

永井主水正達書写

Saga Prefectual Library

Saga Prefectural Library Database

複写 井上周防家関係文書　下

Fukuoka City Museum

Fukuoka City Museum Collection Database

成冨家戦功其外覚書

Saga Prefectual Library

Saga Prefectural Library Database

永井氏家蔵図書之印

National Institute of Japanese Literature

Collectors'Seals Database

成松家御感状并戦功書

Kyushu University Collections

Kyushu University Collections

〔北郷一雲・讃岐守宛書状写〕

ADEAC: A System of Digitalization and Exhibition for Archive Collections

北郷式部太輔様御文書写

ADEAC: A System of Digitalization and Exhibition for Archive Collections

御書附写　(戦功により永世1万石下賜す　他諸侯勲功一覧)

Fukuoka City Museum

Fukuoka City Museum Collection Database

永井荷風家族写真(荷風少年時)

Edo-Tokyo Museum

Tokyo Museum Collection

永井荷風家族写真(荷風青年時)

Edo-Tokyo Museum

Tokyo Museum Collection

永井荷風家族写真(荷風青年時)

Edo-Tokyo Museum

Tokyo Museum Collection

永井荷風家族写真(荷風青年時)

Edo-Tokyo Museum

Tokyo Museum Collection

下郷諏訪社願書起請文写

Tokyo National Museum

Integrated Collections Database of the National Museums, Japan

［井田家旧蔵古写真］大型北前船

Digital Archive Fukui

Digital Archive Fukui

［井田家旧蔵古写真］小型北前船

Digital Archive Fukui

Digital Archive Fukui

[豊田天功（彦次郎）　永井芳之介 宛書簡]

Tokyo Metropolitan Central Library

Tokyo Metropolitan Library Edo-Tokyo Digital Collections

永田雄助、成冨新兵衛書状写

Saga Prefectual Library

Saga Prefectural Library Database

［井田家旧蔵古写真］南北両川下流の漁業船の群

Digital Archive Fukui

Digital Archive Fukui

［井田家旧蔵古写真］北川と高塚橋

Digital Archive Fukui

Digital Archive Fukui

［井田家旧蔵古写真］北川と丸山橋

Digital Archive Fukui

Digital Archive Fukui

［井田家旧蔵古写真］北川の鮎釣り

Digital Archive Fukui

Digital Archive Fukui