Takagi Family Documents Digital Library
- Nagoya University Library
- Nagoya University Graduate School of Humanities
- Hosa Library
- Ogaki City
- Wakayama City
- Kaizu City History and Folklore Museum
- Sekigahara Town History and Folklore Museum
- Okura Institute for the Study of Spiritual Culture
- National Taiwan University Library
- National Archives of Japan
- Nagoyajo-shinkokyokai
- Iwasu Neighborhood Association
- Koueiji Temple
- private collection
- Gifu Prefectural archives