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Titles
- X1
- X - "Untreated syphilis in the male negro - twenty years of clinical observation of untreated syphilitic and presumably non syphilitic groups" by Sidney Olansky, Stanley H.Schuman, Jesse J. Peters, C. A. Smith, Dorothy S. Rambo (1956)1
- X Ray, 18941
- X ray picture of a six-fingered hand1
- X' hemm x'tagmel gax-xemx1
- X-Ray Analysis and Protein Structure1
- X-Ray Diffraction of Protein Crystals1
- X-Z1
- X-ray unit1
- XI - "Untreated syphilis in the male negro - twenty-two years of serologic observations in a selected syphilis study group" by Sidney Olansky, Ad Harris, John C. Cutler, Eleanor V. Price (1956)1
- XI Congreso Panamericano de Farmacia y Bioquimica2
- XI International Conference on AIDS1
- XI, cash account1
- XII1
- XII - "The Tuskegee study of untreated syphilis - the 30th year of observation" by Donald H. Rockwell, Anne Roof Yobs, M. Brittain Moore, Jr. (1964)1
- XII Congresso Brasileiro de Reumatologia1
- XII International Congress of Allergology & Clinical Immunology1
- XIII - "Aortic regurgitation in a study of aged males with previous syphilis" by Joseph G. Caldwell, Eleanor V.Price, Arnold L. Schroeter, Gerald F. Fletcher (1971)1
- XIII, cash and various accounts1
- XIIIes journées nationales de biologie: Lyon, Eurexpo, 26-27 janvier 19901