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Are you Hermann Ruth-Sommer, author of the books below?
Alte Musikinstrumente by Hermann Ruth-Sommer Alte Musikinstrumente by Hermann Ruth-Sommer Alte Musikinstrumente by Hermann Ruth-Sommer Alte Musikinstrumente by Hermann Ruth-Sommer Alte Musikinstrumente by Hermann Ruth-Sommer Alte Musikinstrumente by Hermann Ruth-Sommer Alte Musikinstrumente. Ein Leitfaden für Sammler by Hermann Ruth-Sommer


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