Encyclopedias, Almanacs, Transcripts, and Maps
- Declaration of Professional Responsibility Medicine's Social Contract with Humanity
- Declaration of the Rights of the Child
- Declaration on Physician Independence and Professional Freedom
- Declaration on the Rights of Mentally Retarded Persons
- Decline Effect
- Deep Sea Exploration
- Deep-Sea Diving: Jacques Piccard and Donald Walsh Pilot the Trieste to a Record Depth of 35,800 Feet in the Mariana Trench in the Pacific Ocean
- Deep-Sea Exploration: The HMS Challenger Expedition
- Deep-Sea Hydrothermal Vents: New World under the Ocean
- Deer: Cervidae
- Defensive Wounds
- Deforestation and Desertification
- DeForrest, Henry P
- Dehydroepiandrosterone (DHEA)
- Dehydroepiandrosterone (DHEA)
- Deitton
- Del Rio, Martin Antoine (1551-1608)
- Delanne, Gabriel (1857-1926)
- Deletion 22q11 syndrome
- Deletion 22q11 Syndrome