21. Letter from Francis J. Ryan to Joshua Lederberg

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22. Joshua Lederberg's Nobel medal

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23. Joshua Lederberg with Richard Guildlichter(?)

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24. Joshua Lederberg with Maclyn McCarty

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25. Joshua Lederberg with G. Rosenkrantz at the Syntex Institute of Molecular Biology

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26. Joshua Lederberg with Alex Zaffaroni and J. E. Wallace Sterling at the Syntex Institute for Molecular Biology

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27. Joshua Lederberg with Abe Ribicoff and Wendell Stanley at the White House

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28. Joshua Lederberg with Abe Eisenstark

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29. Joshua Lederberg at the American Society of Microbiology Centennial Meeting

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30. Joshua Lederberg at the American Society of Microbiology Centennial Meeting

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31. Joshua Lederberg at the 1958 Nobel Prize Ceremony

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32. Joshua Lederberg and Luca Cavalli-Sforza in a playful mood

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33. Joshua Lederberg

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34. Genetic Recombination in Escherichia coli: Disputation at Cold Spring Harbor, 1946-1996

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35. Gene Recombination in the Bacterium Escherichia coli

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36. Gene Recombination in Escherichia coli

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37. Francis J. Ryan

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38. Edward L. Tatum at Stanford University

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39. Dr. Francis J. Ryan with a dogfish

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40. Dr. Francis J. Ryan at work at Columbia University

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