〔原直吉書簡〕

〔原直吉葉書〕

Saga Prefectual Library

Saga Prefectural Library Database

〔原幸吉書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

原吉太書簡

Saga Prefectual Library

Saga Prefectural Library Database

吉田直蔵他書簡

Saga Prefectual Library

Saga Prefectural Library Database

〔原吉太郎書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔川原常吉書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔原吉太郎書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔原吉太郎書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔原吉太郎書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔原田幸吉書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔木原吉次書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔原吉太郎書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔川原常吉書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔原吉太郎書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔原吉太郎書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

原田豊吉書簡

Saga Prefectual Library

Saga Prefectural Library Database

〔吉原又二書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

志波原準吉書簡

Saga Prefectual Library

Saga Prefectural Library Database

〔松永直吉他２名書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔直書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

〔直書簡〕

Saga Prefectual Library

Saga Prefectural Library Database

[落合直文　吉川半七 宛書簡]

Tokyo Metropolitan Central Library

Tokyo Metropolitan Library Edo-Tokyo Digital Collections

[檜垣直枝　吉田正春 宛書簡]

Tokyo Metropolitan Central Library

Tokyo Metropolitan Library Edo-Tokyo Digital Collections

書簡（直彬後任に原忠順）

Fukuoka City Museum

Fukuoka City Museum Collection Database