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Botanischer Garten Bonn . Botanical Garden Bonn engraving Botanischer Garten Bonn Stich Helga Stoverock Der Poppelsdorfer Garten vierhundert Jahre Gartengeschichte Dissertation at Bonn University ulb unibonn de pdf Original Osterwald Sinning Clearly old enough to be public domain PDold Botanischer Garten Bonn Bonn in the th