|   | "The Story of Natural Drugs: Cinchona" | 
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|   | "The Story of Natural Drugs: Coca and Peyote" | 
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|   | "The Story of Natural Drugs: Digitalis" | 
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|   | "The Story of Natural Drugs: Opium" | 
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|   | "The Story of Natural Drugs: Quinine" | 
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