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12. Letter from Maxine Singer to Paul Shullenberger
13. Letter from Maxine Singer to Leon A. Heppel
14. Letter from Leon A. Heppel to Maxine Singer
15. Letter from Pedro Galindo to Fred L. Soper
16. Letter from Fred L. Soper to Pedro Galindo
17. Letter from Pedro Galindo to Fred L. Soper
18. Letter from Joshua Lederberg to Ira L. Baldwin
19. Letter from Alan Gregg to A. Warren Stearns
20. Letter from Alan Gregg to Richard M. Pearce
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