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12. Recommendation for Leon Heppel for the Guggenheim Foundation Fellowship
13. Letter from Maxine Singer to Paul Shullenberger
14. Letter from Maxine Singer to Leon A. Heppel
15. Letter from Leon A. Heppel to Maxine Singer
16. Letter from Pedro Galindo to Fred L. Soper
17. Letter from Fred L. Soper to Pedro Galindo
18. Letter from Pedro Galindo to Fred L. Soper
19. Letter from Joshua Lederberg to Ira L. Baldwin
20. Letter from Alan Gregg to A. Warren Stearns
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