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- Hydrodynamics 2
- Hydroelectric power plants 1
- Hydroelectric power plants -- Design and construction 1
- Hydrogen as fuel 4
- Hydrogen bonding 2
- Hydrogen-ion concentration 1
- Hydrogeology 1
- Hydrologic models -- South Africa -- Cape Town 1
- Hydrometallurgy 1
- Hydrophylic oxygen radical absorbance capacity 1
- Hydroponic technique 1
- Hydroponic technology 1
- Hydroponics 11
- Hydrothermal circulation (Oceanography) -- South Africa 1
- Hydroxy compounds. 1
- Hydroxyl group 1
- Hyperactive children -- Education 1
- Hyperglycemia 4
- Hypermedia 1
- Hypertension 1