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6131. Letter from George W. Beadle to C. C. Lindegren

6132. Letter from Norman H. Horowitz to Joshua Lederberg

6134. Many 'Accepted' Additives May Be Cyclamate's Equal

6136. Letter from George W. Beadle to Joshua Lederberg

6137. Letter from Edward A. Adelberg to Joshua Lederberg

6138. Letter from Daniel C. Pease to Joshua Lederberg

6139. Environmental Chemicals' Hazards Still Little Known

6140. Letter from Arthur C. Giese to Joshua Lederberg