Titles
- Postcard from Barbara E. Wright to Joshua Lederberg1
- Postcard from Carl A. Beam to Joshua Lederberg1
- Postcard from Edward L. Tatum to George W. Beadle1
- Postcard from Edward L. Tatum to Joshua Lederberg15
- Postcard from Gordon Allen to Joshua Lederberg1
- Postcard from Joshua Lederberg to Leo Szilard1
- Postcard from Lillian (Schneider) Wainwright to Joshua Lederberg1
- Postcard from Louis G. Nickell to Joshua Lederberg1
- Postcard from M. Demerec to Joshua Lederberg1
- Postcard from Max Delbruck to Tracy M. Sonneborn4
- Postcard from Salvador Dali to Mary Lasker1
- Postcard from Salvador E. Luria to Joshua Lederberg6
- Postcard from Salvador E. Luria to Tracy M. Sonneborn2
- Postcard of Joshua Lederberg (age 4) and his mother, Esther1
- Posto di ristoro, Bologna1
- Pouponnière Madeleine Callier: salle de bains1
- Pour l'empereur! Pour le Japon!1
- Pour me bercer au gré de mon amour, je lis beaucoup et songe à ton retour1
- Pour nos soldats!4
- Pozdrav ze Sokolského lazaretu1