Diplomatic Record Office, Tokyo
Website: http://www.mofa.go.jp/about/hq/record/
[NB. in English]
Historiographical Institute, The University of Tokyo
Website: https://www.hi.u-tokyo.ac.jp/index.html
Archives and Mausoleum Division, Imperial Household Agency (Kunaichō Shoryōbu)
Website: http://www.kunaicho.go.jp/kunaicho/shinsei/kobunshokan.html#H2-03
Kensei Shiryoshitsu, National Diet Library
Website: http://rnavi.ndl.go.jp/kensei/entry/index-31.php
Japanese National Diet Library
Website: www.ndl.go.jp
Nagasaki Museum of History and Culture
Website: http://www.nmhc.jp
The National Archives of Japan
Website: http://www.archives.go.jp/english/