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Collection primarily comprises New York psychiatrist Percy E. Ryberg's personal family correspondence (in particular with his wife, Barbara), diaries, and other personal papers, some of which speak to Ryberg's youth in Argentina. Professional correspondence, articles, and other items document his career and interests in sexual and mental health, substance abuse treatments, identity, spiritual and astrological aspects of medicine, and other topics, and the publication of his book, Health, Sex, and Birth Control. Also includes biographical and genealogical information; Ryberg's 1944 court martial and later notes about appealing it; photographs and photograph albums; and glass plate negatives. Acquired by the History of Medicine Collections at Duke University.