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  1. Opium - Wikipedia

  2. Opium poppy | Description, Drugs, & Seeds | Britannica

  3. Opium - DEA.gov

  4. Papaver somniferum — opium poppy - Go Botany

  5. Opium Poppy - DEA Museum

  6. How to Successfully Grow Opium Poppies: A Field Guide to ... - Gardenista

  7. Morphology, Taxonomy, Anatomy, and Palynology of the Opium …

  8. The opium poppy, morphine, and verapamil - PMC

  9. In the Beginning: A History Of Opium - Drew Pinsky