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6161. Letter from George W. Beadle to Joshua Lederberg

6162. Letter from Norman H. Horowitz to George W. Beadle

6163. Letter from George W. Beadle to Joshua Lederberg

6164. National Drug Test Center Would Be a Salutary Step

6165. A Case History in Biological Research

6166. Letter from James Murray Luck to Joshua Lederberg

6167. Letter from David Perkins to Joshua Lederberg

6168. Letter from Nawin C. Mishra to Joshua Lederberg

6169. Additives Shouldn't Harm Even One in Million

6170. Letter from E. B. Fred to Joshua Lederberg