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2. Letter from George F. Cahill Jr to Daniel Nathans
3. Letter from Daniel Nathans to Purnell Choppin
4. Letter from Maxine Singer to Debi P. and Maharani Burma (Chakravorty)
5. Excerpt from Fred Soper's diary
6. Letter from W. H. Crichton to D. Gordon Cheyne
7. Letter from W. H. Crichton to D. Gordon Cheyne
8. Letter from C.M.F. to C.G.S.
9. Excerpt from Fred Soper's first report as the Pan American Health Organization's director
10. Agreement between the World Health Organization and Pan American Sanitary Organization
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