Alphabetical listing of categories: A

abandoned mines and quarries (2) atomic absorption analysis (1) relative abundance analysis (1) accelerators -> research facilities (1) acid deposition (6) acidic deposition -> acid deposition (6) acid precipitation -> acid deposition (6) acid rain -> acid deposition (6) acid snow -> acid deposition (6) acoustic doppler current profiler -> acoustic doppler current profiling (1) acoustic doppler current profiling (1) acoustic methods (29) neutron activation analysis (1) seismic activity -> earthquake occurrences (37) volcanic activity (48) earthquake activity maps (10) -> earthquake occurrences WITH maps and atlases ADCP -> acoustic doppler current profiling (1) adits (mine sites) -> mine sites (7) administrative and political boundaries (4) administrative areas (8) administrative divisions -> administrative areas (8) second-order administrative divisions -> countries, 2nd order divisions (1) administrative facilities -> buildings (3) adminstrative facilities -> buildings (3) Advanced Very High Resolution Radiometer (AVHRR) -> AVHRR (9) aerial photographs (19) -> aerial photography WITH image collections aerial photography (26) aerial photos (19) -> aerial photography WITH image collections aeromagnetic maps (4) -> aeromagnetic surveying WITH maps and atlases aeromagnetic surveying (9) aeroradiometric surveying (2) Rb-Sr age analysis -> rubidium-strontium analysis (2) age dating (fission-track) -> fission-track dating (3) age dating (radiometric) -> radiometric dating (10) age dating (tree ring) -> tree ring analysis (1) radiometric age determination -> radiometric dating (10) age estimation methods (5) agricultural colonies -> populated places (7) agricultural facilities -> agricultural sites (3) agricultural regions (1) agricultural reserves -> agricultural sites (3) agricultural sites (3) agricultural water use (3) agriculture (7) airborne imaging -> remote sensing (82) airborne visible infrared imaging spectrometer -> AVIRIS (1) air photos (19) -> aerial photography WITH image collections air pollution (5) -> contamination and pollution WITH atmospheric composition air routes -> transportation features (4) air temperature (2) air transportation -> transportation (1) algae (11) algal blooms (3) algology -> phycology (5) alien species -> nonindigenous species (45) ferns and fern allies (1) grazing allotments -> agricultural sites (3) alluvial fans (2) alluvial sedimentation -> sedimentation (28) alluvial transport -> sediment transport (26) alluvium -> unconsolidated deposits (12) habitat alteration (15) altimetry measurement (1) amphibians (18) anabranches -> streams (51) anadromous fish (1) -> migratory species WITH fish atomic absorption analysis (1) carbon-14 analysis (1) carbon isotope analysis (3) chemical analysis (28) core analysis (8) Curie temperature analysis (1) environmental analysis -> environmental assessment (35) geospatial analysis (17) grain-size analysis (2) grainsize analysis -> grain-size analysis (2) image analysis (7) isotopic analysis (14) laboratory-induced magnetization analysis (1) light stable-isotope analysis -> light stable isotope analysis (9) light stable isotope analysis (9) magnetic susceptibility analysis (2) mineralogical analysis -> chemical analysis (28) natural remanent magnetization analysis (1) natural remnant magnetization analysis -> natural remanent magnetization analysis (1) neutron activation analysis (1) oxygen isotope analysis (2) paleomagnetic analysis (3) particle-size analysis -> grain-size analysis (2) pollen analysis -> faunal and floral census (microscopic) (1) potassium-argon analysis (1) Rb-Sr age analysis -> rubidium-strontium analysis (2) regression analysis (1) relative abundance analysis (1) rubidium-strontium analysis (2) spatial analysis (19) stable isotope analysis -> light stable isotope analysis (9) statistical analysis (9) time series analysis (1) topological analysis (1) tree ring analysis (1) tritium analysis (1) uranium-lead analysis (1) uranium-thorium analysis (1) temperature analysis (Curie) -> Curie temperature analysis (1) anatomy and physiology (5) anchorages -> harbors (4) anclajes -> harbors (4) sexing (plants and animals) -> sexing (plants & animals) (2) plant and animal tagging (4) plant and animal testing (3) bryozoans and brachiopods (1) atmospheric and climatic processes (84) population and community ecology (285) drilling and coring (16) water supply and demand (46) culture and demographics (10) rocks and deposits (55) information system design and development (25) instrument design and development (11) organism growth and development (9) health and disease (54) waste treatment and disposal (16) business and economics (3) extinction and extirpation (4) ferns and fern allies (1) faunal and floral census (microscopic) (1) pesticide and herbicide contamination (12) liverworts and hornworts (1) snow and ice cover (19) land use and land cover (48) field inventory and monitoring (326) butterflies and moths (6) atmospheric deposition (chemical and particulate) -> atmospheric deposition (chemical & particulate) (6) biological and physical processes (515) anatomy and physiology (5) animal and plant census (3) administrative and political boundaries (4) contamination and pollution (98) abandoned mines and quarries (2) mining and quarrying (13) LIght Detection and Ranging (LIDAR) -> LIDAR (3) laws and regulations (1) real-time monitoring and reporting (170) systematics and taxonomy (17) bees and wasps (1) sea anemones -> coelenterates (7) animal and plant census (3) animal behavior (8) animal distribution -> biogeography (69) animal pounds -> buildings (3) animals (172) distribution of animals -> biogeography (69) sexing (plants & animals) (2) sexing (plants and animals) -> sexing (plants & animals) (2) animal shelters -> buildings (3) animal tagging -> plant and animal tagging (4) plant and animal tagging (4) animal testing -> plant and animal testing (3) plant and animal testing (3) animal tracking (13) annelids -> segmented worms (2) geochemical anomaly maps (9) -> geochemistry WITH maps and atlases gravity anomaly maps (5) -> gravitational field (earth) WITH maps and atlases magnetic anomaly maps (8) -> magnetic field (earth) WITH maps and atlases anoxia -> oxygen content (water) (8) anthracite resources -> coal resources (12) Interferometric Synthetic Aperture Radar (IFSAR) -> IFSAR (4) aprons (geological) -> physiographic features (86) aquaculture (1) aquariums -> buildings (3) aquatic biology (47) aquatic ecosystems (103) aquatic vegetation (1) aquifer level -> ground-water level (7) aquifers (29) arachnids (1) arboreal ecosystems -> forest ecosystems (18) arboretums -> parks (8) archaea (1) archaebacteria -> archaea (1) archaeological centers -> research facilities (1) island arcs -> islands (6) Arctic land -> tundras (2) administrative areas (8) chapparal areas -> shrublands (3) civil areas -> administrative areas (8) commemorative areas -> parks (8) concession areas -> administrative areas (8) conservation areas -> reserves (2) cultivated areas -> agricultural sites (3) demonstration areas -> reserves (2) environmental areas -> reserves (2) experimental areas -> research areas (3) game management areas -> reserves (2) grazing areas -> grasslands (10) karst areas (3) metropolitan areas -> populated places (7) mineral deposit areas (5) mining areas -> mine sites (7) natural areas -> reserves (2) offshore areas -> coastal zones (44) peat cutting areas -> wetlands (27) picnic areas -> parks (8) political areas (1) primitive areas -> reserves (2) protected areas -> reserves (2) public use areas -> parks (8) quicksand areas -> bars (physiographic) (1) recreation areas -> parks (8) research areas (3) rest areas -> parks (8) riparian areas -> wetlands (27) roadless areas -> reserves (2) salt deposit areas -> mineral deposit areas (5) sandy areas -> beaches (2) scenic areas -> parks (8) study areas -> research areas (3) urban areas -> cities (5) wilderness areas -> parks (8) wildlife areas -> reserves (2) leased areas (government) -> administrative areas (8) management areas (reserves) -> reserves (2) argon-argon dating -> radiometric dating (10) arid regions -> deserts (8) arroyos (2) arrugados -> seafloor features (10) arthropods (30) artificial recharge -> water resource management (16) volcanic ash -> volcanic rocks (4) environmental assessment (35) environmental impact assessment -> environmental assessment (35) landslide susceptibility assessment (3) natural resource assessment (23) resource assessment -> natural resource assessment (23) risk assessment (24) freely associated states -> political areas (1) asteroid impact -> impact cratering (3) asthenosphere (1) astronomy -> planetary sciences (14) atmosphere properties -> atmospheric properties (10) atmospheric and climatic processes (84) atmospheric circulation (2) atmospheric composition (8) atmospheric deposition (chemical & particulate) (6) atmospheric deposition (chemical and particulate) -> atmospheric deposition (chemical & particulate) (6) atmospheric properties (10) atmospheric sciences (30) atolls -> islands (6) atomic absorption analysis (1) atomic centers -> research facilities (1) atomic emission spectroscopy (2) natural attenuation (harmful chemicals) -> biodegradation (1) avalanches -> landslides (14) debris avalanches -> landslides (14) AVHRR (9) AVHRR images (7) -> AVHRR WITH image collections avian flu -> avian influenza (4) avian influenza (4) aviation -> transportation (1) aviation safety (1) AVIRIS (1)

Alphabetical index of categories: A