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5212. Is Sex Infectious?

5213. Letter from Edward A. Adelberg to Esther Lederberg

5215. Letter from Edward A. Adelberg to Esther Lederberg

5216. Letter from Jon Beckwith to Joshua Lederberg

5217. A Variant Sex Factor in Escherichia coli

5218. Letter from Edward A. Adelberg to Joshua Lederberg

5219. Letter from William C. Bushell to Joshua Lederberg