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Alphabetical index of categories: H

a b c d e f g H i j k l m n o p q r s t u v w x y z

Number of information resources is shown in parentheses after each term.

H5N1 -> avian influenza (7) habitat alteration (13) habitat destruction -> habitat alteration (13) habitats (30) habitats (2) city halls -> buildings (13) halls -> buildings (13) town halls -> buildings (13) halting places (transportation) -> transportation features (4) hamlets -> populated places (7) hammocks -> physiographic features (237) hand-held field spectroscopy -> handheld field spectroscopy (1) handheld field spectroscopy (1) hanging valleys -> valleys (3) harbors (4) harbours -> harbors (4) water hardness (3) hardness (water) -> water hardness (3) seismic hazard maps (14) -> maps and atlases -> earthquake occurrences hazard mitigation -> hazard preparedness (67) hazard preparedness (67) earthquake hazards (50) -> earthquakes -> hazards environmental hazards -> hazards (169) geologic hazards -> hazards (169) hazards (169) mining hazards (10) headlands -> capes (1) headquarters -> buildings (13) park headquarters -> buildings (13) headwaters -> drainage basins (63) human health -> environmental health (human) (29) environmental health (human) (29) health (human) -> environmental health (human) (29) health and disease (76) health facilities -> medical facilities (2) slag heaps -> disposal sites (2) heatflow (earth) -> heat flow (earth) (1) heat flow (earth) (1) heaths -> shrublands (2) gage height -> streamflow (157) herbicide contamination -> pesticide and herbicide contamination (24) pesticide and herbicide contamination (24) herbivores (1) heredity -> genetics (8) herpetology (19) Hg -> mercury (8) high-pressure liquid chromatography -> liquid chromatography (1) Advanced Very High Resolution Radiometer (AVHRR) -> AVHRR (10) highway maintenance sites -> transportation features (4) highways -> roadways (2) hiking -> recreation (6) hills -> mountains (6) climate history -> climate change (69) earth history (5) geologic history (42) life history -> population and community ecology (381) strain history -> deformation (geologic) (10) Ho -> holmium (5) holes (seafloor) -> seafloor features (15) hollows -> valleys (3) holmium (5) nursing homes -> medical facilities (2) homesteads -> populated places (7) horizontal datums -> map coordinate systems (3) liverworts and hornworts (1) horticulture -> agriculture (15) hospitals -> medical facilities (2) hostels -> buildings (13) hotels -> buildings (13) hot springs -> thermal features (6) club houses -> buildings (13) community houses -> buildings (13) customs houses -> buildings (13) houses -> buildings (13) HPAI -> avian influenza (7) HPLC -> liquid chromatography (1) human disease -> environmental health (human) (29) human environmental safety (12) human health -> environmental health (human) (29) human impacts (107) hunting -> recreation (6) hunting reserves -> reserves (6) hurricanes (27) livestock husbandry -> agriculture (15) gas hydrate resources (8) methane hydrate resources -> gas hydrate resources (8) hydraulic engineering (9) hydraulic models -> hydraulic engineering (9) hydraulics -> hydraulic engineering (9) hydroacoustics -> acoustic doppler current profiling (2) hydrodynamics (3) hydroelectric power generation water use -> power generation water use (5) hydroelectric power stations -> power generation sites (1) hydrogeology (37) hydrographic datasets (106) hydrographic features (298) hydrographic sections -> hydrogeology (37) hydrographic structures (35) hydrologic cycle -> water cycle (5) hydrologic maps (28) -> hydrology -> maps and atlases hydrologic processes (250) hydrology (410) hydrophytes -> aquatic vegetation (3) hydrosphere -> water resources (383) hydrothermal processes (6) hyperspectral imaging (5) hyporheic zone processes -> groundwater and surface-water interaction (5) hypoxia -> oxygen content (water) (13)

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