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Holly (plant)
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Horst (geology and geodesy)
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Hospital infections (medical bacteriology, mycology, parasitology)
Hot spots (geology)
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Human Genome Project (in genetics)
Human variation (anthropology)
Human-computer interaction (computing)
Human-factors engineering (design engineering)
Humidistat (mechanical engineering)
Humidity (in meteorology)
Humidity control (mechanical engineering)
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