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3 Pages in
Charles Darwin's Library
associated with "flora - Viola canina"
Befruchtung der Blumen durch Insekten
By: Müller, Hermann.
Publication info: Leipzig, Wilhelm Engelmann, 1873
Pages:
Page 146
Das entdeckte Geheimnis der Natur im Bau und in der Befruchtung der Blumen
By: Sprengel, Christian Konrad.
Publication info: Berlin, F. Vieweg, 1793
Pages:
Page 397
Page 399