A massive repository where you can find digitized versions of classic martial arts manuals and books on Japanese history.
To find books specifically on Russian platforms (where your original query originated), use these terms in search engines: (Ninjutsu books PDF) nindziutsu skachat knigu besplatno
A legendary martial arts historian whose books provide the most accurate historical context for the Shinobi. 4. Search Tips for Russian-Language Resources A massive repository where you can find digitized