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7131. Letter from Joshua Lederberg to Irving H. Sher

7132. Letter from Joshua Lederberg to Eugene Garfield

7133. Letter from Joshua Lederberg to Eugene Garfield

7136. The Estimation of Mutation Rates

7137. Genetic Recombination in Bacteria

7138. Letter from Edward A. Adelberg to Joshua Lederberg

7139. Genetic Evidence for Sex in Bacteria

7140. Linkage in E. coli K-12 [Abstract]