Books by August de Ridder:
Books in the extended shelves:
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Ridder, August de, 1837-1911: The collection of pictures of the late Herr A. de Ridder, formerly in his villa at Shönberg near Cronberg in the Taunus (New York : F. Kleinberger Galleries, 1913), also by Wilhelm von Bode, Harry Virgin, and F. Kleinberger Galleries (page images at HathiTrust)
Find more by August de Ridder at your library, or elsewhere.