- Hall Effect
- Hamilton, Alexander
- Hand Tools, Machines, and Machine Tools
- Handling, Bulk
- Handling (Bulk), Transportation and Storage
- Heat
- Heating, Cooling, Cooking, and Air Conditioning
- Heating Fuel (Oil)
- Herbicides
- Hinny (def)
- Home Construction [TBC]
- Horse
- Horticulture, Edible
- Houston, William
- Houston, William C.
- HTML (HyperText Markup Language) (def)
- HTTP (HyperText Transfer Protocol) (def)
- Human Anatomy and Physiology
- Human Diseases
- Husbandry, Animal
- Husbandry, Crop
- Hydration
- Hydrocarbons
- Hydrogenation
- Hygrometer
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