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This Foreign Service memo treats a science-fictional subject—the existence of the Yeti, or the Abominable Snowman—with utmost bureaucratic seriousness. Titled “Regulations Governing Mountain Climbing Expeditions in Nepal—Relating to Yeti,” it was issued from the American Embassy in Kathmandu on November 30, 1959.
For the rest of the story: http://www.slate.com/blogs/the_vault/2013/02/26/search_for_yeti_the_foreign_service_memo_advising_yeti_hunters.html