While not a download site, it is the most authoritative guide for classical Japanese martial arts (Koryu), offering articles and reading lists to help you identify which books are worth seeking out.
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If you are looking for specific, high-quality instruction, search for these names in digital library catalogs:
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Communities like E-Budo or Bullshido often have "Recommended Reading" threads where users share links to free PDFs of out-of-print manuals. 3. Key Authors to Search For While not a download site, it is the
To find books specifically on Russian platforms (where your original query originated), use these terms in search engines: (Ninjutsu books PDF)