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Start Over You searched for: main Remove constraint main Publication Year 1999 Remove constraint Publication Year: <span class="single" data-blrl-single="1999">1999</span>

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1. Letter from John P. Holdren to Joshua Lederberg

2. E-Mail from Joshua Lederberg to Roger D. Launius

6. National Library of Medicine classification: a scheme for the shelf arrangement of library materials in the field of medicine and its related sciences