Up for auction on eBay is an article reprint of a piece that William S. Burroughs published in a 1956 issue of the scientific publication British Journal of Addiction. It was titled, appropriately enough, "Letter From A Master Addict To Dangerous Drugs." Starting bid is $1950.
From the auction listing:
After publishing the fictionalized autobiography Junkie under the pseudonym William Lee," Burroughs contributed a non-fiction account of his wide-ranging drug use to the venerable British Journal of Addiction, an obscure medical journal. At his request, the Journal sent Burroughs fifty (50) copies of a stapled offprint of the article. Burroughs was, at the time, living in Tangiers and furthering his "drug research;" thus it is likely that far fewer than fifty copies survive to this day.