- One Piece Positive Pressure Ventilated Suits1
- One of two birthday cakes made for Michael DeBakey for his 90th birthday celebration at NLM (image 1)1
- One of two birthday cakes made for Michael DeBakey for his 90th birthday celebration at NLM (image 2)1
- Operating room at the 8063rd MASH, South Korea1
- Operation planning chart for separating a pair of Siamese twins1
- Osler (age 7) and neighborhood children at the Perram Farm, Tecumseth Parish, Ontario1
- Osler family on the terrace of 13 Norham Gardens1
- Oslers with friends and family in Oxford1
- Oswald Avery at the College of Physicians and Surgeons in New York1
- Oswald T. Avery postcard1
- Oswald T. Avery, Christmas1
- Oswald T. Avery, Deer Isle, Maine1
- Oswald T. Avery, Rockefeller Institute1
- Oversized portrait of Michael DeBakey (at his desk in scrubs)1
- Oversized portrait of Michael DeBakey (dark background)1
- Oversized portrait of Michael DeBakey (tapestry background)1
- P.S. Carley at a Malaria Survey Section's camp at Lake Huleh, Palestine1
- PP-CAO, the "flying cow" airplane, in Corumba, Brazil1
- Painting of Michael DeBakey1
- Palpation: Snapshots of Osler at the Bedside1