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5232. Letter from Ernest Nagel to Joshua Lederberg

5233. Science Can't Be Dogmatic About Virgin Birth in Man

5235. Letter from Joshua Lederberg to David L. Nanney

5236. Letter from Unknown to Joshua Lederberg

5237. Letter from Joshua Lederberg to Purnell Choppin

5238. Letter from Joshua Lederberg to F. Ratliff

5239. Unpredictable Variety Still Rules Human Reproduction