Wagner, Richard: The Ring of the Niblung : 1. The Rhinegold & the Valkyrie / Richard Wagner. Transl. by Margaret Armour. With illustr. by Arthur Rackham. London [u.a.]. London [u.a.] : Ballantyne & Co., 1910. Badische Landesbibliothek Karlsruhe
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https://nbn-resolving.org/urn:nbn:de:bsz:31-160445 / CC-BY-SA-Lizenz (4.0)