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5221. Letter from David M. Mumford to Joshua Lederberg

5222. Letter from David M. Mumford to Joshua Lederberg

5223. Crossbreeding is Nature's Device to Speed Evolution

5224. Letter from Joshua Lederberg to David M. Mumford

5225. Letter from David M. Mumford to Joshua Lederberg

5226. Letter from David M. Mumford to Joshua Lederberg

5227. Letter from Joshua Lederberg to Daniel J. Murphy

5228. Letter from Daniel J. Murphy to Joshua Lederberg

5229. Letter from Joshua Lederberg to Walter F. Murphy

5230. Letter from Joshua Lederberg to Walter F. Murphy