File:Lehrbuch der organischen Chemie (Kekule) I 720.jpg
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![File:Lehrbuch der organischen Chemie (Kekule) I 720.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/16/Lehrbuch_der_organischen_Chemie_%28Kekule%29_I_720.jpg/400px-Lehrbuch_der_organischen_Chemie_%28Kekule%29_I_720.jpg?20080101194645)
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