Alphabetical listing of categories: P

P -> phosphorus (3) pagodas -> towers (1) paleobotany (2) paleoceanography (7) paleoclimate -> climate change (68) paleogeography (1) paleomagnetic analysis (3) invertebrate paleontology (1) paleontology (21) vertebrate paleontology (5) paleoseismology (4) paleotectonic maps (6) -> tectonic processes WITH maps and atlases paleozoology -> paleontology (21) palm groves -> woods (1) oil palm plantations -> agricultural sites (5) palm tree reserves -> reserves (5) palynology (4) pampas -> grasslands (10) pamphlets, brochures, and booklets -> reports (105) papers (publications) -> reports (105) parasitism -> symbiosis (1) parasitology (3) parishes -> countries, 2nd order divisions (1) park gates -> parks (14) park headquarters -> buildings (12) parking lots -> parking sites (1) parking sites (1) industrial parks -> industrial sites (2) marine parks -> parks (14) national parks -> parks (14) parks (14) provincial parks -> parks (14) state parks -> parks (14) urban parks -> parks (14) parkways -> roadways (2) particle-beam spectroscopy (1) particle-size analysis -> grain-size analysis (3) atmospheric deposition (chemical & particulate) (9) atmospheric deposition (chemical and particulate) -> atmospheric deposition (chemical & particulate) (9) land partitioning systems -> cadastral and legal land descriptions (1) partnerships (36) pastoral sites -> agricultural sites (5) pastures -> agricultural sites (5) ice patches -> ice masses (8) pathobiology -> pathology (27) pathology (27) patrol posts -> buildings (12) pavilions -> buildings (12) Pb -> lead (6) PCBs -> industrial pollution (24) peaks -> mountain summits (1) peat cutting areas -> wetlands (38) peatlands -> wetlands (38) pedogenesis -> soil formation (3) pedology (soils) -> soil sciences (5) peninsulas -> capes (1) percolation (1) permafrost (2) pest control (1) pesticide and herbicide contamination (23) petroleum (68) petroleum basins -> mineral deposit areas (76) petroleum fields -> oil fields (1) petroleum resources (gas) -> natural gas resources (85) petroleum resources (oil) -> oil resources (81) petrology (2) water pH (10) pH (water) -> water pH (10) pharmaceutical contamination (3) phenology (10) phosphate works -> industrial sites (2) phosphorus (3) phosphorus content -> nutrient content (water) (22) photogrammetry -> remote sensing (108) aerial photographs (18) -> aerial photography WITH image collections photographs (29) -> image collections WITH photography scientists-at-work photographs (2) -> scientific careers WITH image collections aerial photography (36) photography (51) satellite photography -> visible light imaging (4) underwater photography (3) aerial photos (18) -> image collections WITH aerial photography air photos (18) -> image collections WITH aerial photography phycology (3) phylogeny -> paleontology (21) physical oceanography -> ocean sciences (51) biological and physical processes (714) physiographic features (214) physiography -> land surface characteristics (54) physiological processes (8) anatomy and physiology (6) physiology -> anatomy and physiology (6) phytoplankton (1) picnic areas -> parks (14) pictures -> image collections (101) piers (1) pine groves -> woods (1) pitches (physiographic) -> physiographic features (214) open pit mines -> mine sites (15) gravel pits -> mine sites (15) placer deposit mining (1) placer mines -> mine sites (15) placers -> mineral deposit areas (76) governed places -> administrative areas (8) populated places (7) religious populated places -> populated places (7) halting places (transportation) -> transportation features (4) coastal plains -> coastal zones (76) plains (1) plains ecosystems -> grassland ecosystems (15) planetariums -> buildings (12) planetary bodies (10) planetary sciences (7) planetology -> planetary sciences (7) plankton (5) planktonic ecosystems (4) -> aquatic ecosystems WITH plankton emergency response planning -> hazard preparedness (60) environmental planning -> natural resource management (258) planning reports -> reports (105) strategic plans (5) plant and animal tagging (7) plant and animal testing (5) banana plantations -> agricultural sites (5) cotton plantations -> agricultural sites (5) oil palm plantations -> agricultural sites (5) plantations -> agricultural sites (5) rubber plantations -> agricultural sites (5) sisal plantations -> agricultural sites (5) sugar plantations -> agricultural sites (5) tea plantations -> agricultural sites (5) animal and plant census (20) plant distribution -> biogeography (69) cement plants -> industrial sites (2) distribution of plants -> biogeography (69) filter plants -> waterworks (1) filtration plants -> waterworks (1) flowering plants (8) gas-oil separation plants -> industrial sites (2) munitions plants -> industrial sites (2) non-vascular plants -> nonvascular plants (7) nonvascular plants (7) ore treatment plants -> industrial sites (2) processing plants -> industrial sites (2) sewage treatment plants -> waterworks (1) treatment plants -> buildings (12) vascular plants (10) water plants -> waterworks (1) water treatment plants -> waterworks (1) plants (industrial) -> industrial sites (2) plants (organisms) (25) inductively coupled plasma-atomic emission spectrometry -> atomic emission spectroscopy (4) plateaus (2) plate tectonics -> tectonic processes (20) platforms (continental margins) -> continental margins (11) platinum (1) playgrounds -> parks (14) plazas -> buildings (12) plot sampling (2) Plutonic rocks (1) Pm -> prometium (5) podcasts -> sound recordings (4) points (physiographic) -> capes (1) polar bears -> bears (8) polders -> physiographic features (214) police posts -> buildings (12) policies and regulations (7) political areas (1) administrative and political boundaries (5) political boundaries -> administrative and political boundaries (5) dependent political entities -> political areas (1) independent political entities -> political areas (1) political entities -> political areas (1) semi-independent political entities -> political areas (1) pollen analysis -> faunal and floral census (microscopic) (3) pollination (3) pollinators (3) air pollution (7) -> contamination and pollution WITH atmospheric composition contamination and pollution (167) industrial pollution (24) nonpoint-source pollution (9) pollution -> contamination and pollution (167) soil pollution (1) -> soil resources WITH contamination and pollution water pollution (11) -> contamination and pollution WITH water resources polychlorinated biphenyls -> industrial pollution (24) polymerase chain reaction (3) pond ecosystems -> freshwater ecosystems (26) beaver ponds -> lakes (33) fish ponds -> lakes (33) intermittent ponds -> lakes (33) intermittent salt ponds -> lakes (33) ponds -> lakes (33) salt evaporation ponds -> lakes (33) salt ponds -> lakes (33) tailing ponds -> disposal sites (2) intermittent pools -> lakes (33) pools (water bodies) -> lakes (33) populated localities -> populated places (7) populated places (7) population and community ecology (371) population dynamics (35) population energetics -> population and community ecology (371) biological population management (49) wildlife population management (21) portages -> transportation features (4) ports -> harbors (4) global positioning measurement -> GPS measurement (9) posters (17) border posts -> buildings (12) customs posts -> buildings (12) patrol posts -> buildings (12) police posts -> buildings (12) trading posts -> buildings (12) potable water -> drinking water use (4) potassium (1) potassium-argon analysis (1) potentiometric surface -> groundwater level (24) potholes -> physiographic features (214) animal pounds -> buildings (12) hydroelectric power generation water use -> power generation water use (5) power generation water use (5) thermoelectric power generation water use -> power generation water use (5) powerpoint -> presentation materials (3) ppl -> populated places (7) Pr -> praseodymium (5) prairie ecosystems -> grassland ecosystems (15) prairies -> grasslands (10) praseodymium (5) acid precipitation -> acid deposition (6) precipitation (atmospheric) (32) precipitation measurement (10) -> field inventory and monitoring WITH precipitation (atmospheric) predators -> carnivores (6) earthquake prediction -> earthquake probabilities (18) volcanic eruption prediction (6) prefectures -> administrative areas (8) earthquake preparedness (19) fire preparedness (4) -> fires WITH hazard preparedness flood preparedness (7) -> floods WITH hazard preparedness hazard preparedness (60) landslide preparedness (6) -> hazard preparedness WITH landslides tsunami preparedness (6) -> tsunamis WITH hazard preparedness presentation materials (3) oral presentations -> speeches and testimony (1) data preservation (3) ecosystem preservation -> ecosystem management (26) preserves -> reserves (5) press releases -> news releases (11) fire prevention -> fire control (1) primitive areas -> reserves (5) earthquake probabilities (18) conference proceedings (4) proceedings -> reports (105) atmospheric and climatic processes (164) bioenergetic processes -> biological and physical processes (714) biogeochemical processes -> biogeochemical cycling (13) biological and physical processes (714) coastal processes (32) ecological processes (96) environmental processes -> ecological processes (96) estuarine processes (2) fluvial processes -> streamflow (148) geochemical processes (17) geologic processes (308) hydrologic processes (234) hydrothermal processes (6) hyporheic zone processes -> groundwater and surface-water interaction (4) legal processes -> laws and regulations (2) ocean processes (43) physiological processes (8) tectonic processes (20) processing plants -> industrial sites (2) production buildings -> industrial sites (2) biological productivity (1) degradation products (chemical) -> pesticide and herbicide contamination (23) product support -> customer support and user feedback (4) product types (689) acoustic doppler current profiler -> acoustic doppler current profiling (2) seismic profiles -> seismic methods (44) acoustic doppler current profiling (2) computer program -> scientific software (29) computer programming -> software development (1) programming -> software development (1) contract research programs -> external research support (4) interagency programs (43) interdisciplinary programs (6) international programs (8) science programs (116) map projections -> map coordinate systems (3) prometium (5) promontories -> capes (1) atmosphere properties -> atmospheric properties (22) atmospheric properties (22) earth material properties (7) water properties (70) water properties (marine) -> marine chemistry (5) geotechnical properties maps (2) -> maps and atlases WITH engineering geology prospecting -> natural resource exploration (11) protected areas -> reserves (5) protectorates -> administrative areas (8) protists (5) protozoans -> protists (5) provincial parks -> parks (14) proving grounds -> research facilities (4) Pt -> platinum (1) lists of publications -> catalogs and indexes (98) serial publications -> reports (105) public buildings -> buildings (12) public use areas -> parks (14) public water supply -> domestic water use (10) published series -> reports (105) publishing (3) pueblos -> populated places (7) pyroclastic -> volcanic rocks (6) pyroclastic flows -> volcanic activity (65)

Alphabetical index of categories: P