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Opium - Wikipedia
Opium poppy | Description, Drugs, & Seeds | Britannica
Opium - DEA.gov
Papaver somniferum — opium poppy - Go Botany
Opium Poppy - DEA Museum
How to Successfully Grow Opium Poppies: A Field Guide to ... - Gardenista
Morphology, Taxonomy, Anatomy, and Palynology of the Opium …
The opium poppy, morphine, and verapamil - PMC
In the Beginning: A History Of Opium - Drew Pinsky