Books by Herm. Wilhelm Walther Horn:
Books in the extended shelves:
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Horn, Herm. Wilhelm Walther, 1871-1939: 3. Wanderversammlung Deutscher Entomologen in Giessen (22-26. V. 1929) (Berlin-Dahlem, 1929), also by 3d Wanderversammlung deutscher entomologen and Fritz van Emden (page images at HathiTrust)
Find more by Herm. Wilhelm Walther Horn at your library, or elsewhere.