Titles
- Peter Brian Medawar1
- Petition condemning the Arab blockade of the Straits of Tiran the Gulf of Aqaba1
- Petition from Nobel Laureates to Pope Paul VI - American version1
- Petition from Nobel Laureates to Pope Paul VI - British version1
- Petition in support of Lyndon B. Johnson1
- Petition to President Lyndon Johnson expressing concern over existing restraints on employment of chemical and biological weapons1
- Petition to President Richard M. Nixon1
- Peyton Rous1
- Pharmacology experiment1
- Philadelphia General Hospital: Aerial view1
- Philadelphia Student Health Project, summer 19681
- Photograph contact sheet from Lederberg interview in front of his exobiology equipment at Stanford University1
- Photograph of Francis Crick lecturing in Mainz, Germany1
- Photograph of Francis Crick lecturing in Mainz, Germany, looking behind him and to his right1
- Photograph of Francis Crick lecturing in Mainz, Germany, looking down at his lectern1
- Pill Heralds Biological Change1
- Pinel unchains the insane1
- Planetary Exploration and Biological Research1
- Poets Knew it All Along1
- Policy Resolution Concerning Quarantine of Materials of Planetary Origin1