Encyclopedias, Almanacs, Transcripts, and Maps
- Husk, Cecil (1847-1920)
- Hutias: Capromyidae
- Hutin, Serge Roger Jean (1929-)
- Huxley, Aldous
- Hybrid Transportation
- Hydantoins
- Hydesville
- Hydranencephaly
- Hydrocarbons
- Hydroelectricity and the "Big Dam Era"
- Hydroids: Hydrozoa
- Hydrolethalus Syndrome
- Hydromyelia
- Hydrophobic and Hydrophilic
- Hydrops Fetalis
- Hydrops fetalis
- Hydrostatic Pressure
- Hydrothermal Processes
- Hydrothermal Vent and Cold Seep Worms: Vestimentifera
- Hyle