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pack test packing PAI palatability paleoclimate paleoecology palustrine pan pandemic panoramic photograph pant-growth regulator PAR paradigm paradigm shift parallax parallax bar parallax difference parallax wedge parallel parallel attack parasite parasitism parasitization parasitoid parenchyma parent material pareto optimality parkland parkland system parthenocarpy parthenogenesis parthenogenisis partial cutting partial log suspension participatory forestry particle board particle size distribution partnership pasture patana patch patch cutting paternal effect pathfinding pathname pathogen pathogenicity pathological disease patrol patrol time pattern payload PCT peak discharge peak flow peat peat bog peavey ped pedalfer pedigree pedocal pedogenesis pedon peduncle peel peeler peg-raker saw peg-tooth saw pelagic pellet peneplain per unit sale perched groundwater perched water table percolation perennial stream perfect stage periderm periodic annual increment periodic grazing periodic increment peripheral periphyton permafrost permanent wilting point permeability permit holder permittee permutations personal protective equipment PERT pest pest management pesticide pH phanerophyte phellem phelloderm phellogen phenology phenotype pheromone phloem photo base photo distance photo index map photo interpretation photo map photo rectification photo scale reciprocal photogrammetry photograph nadir photoperiodism photosynthesis photosynthetically active radiation phototropism phreatic phreatophyte phyllosilicate minerals phyllosphere phylogeny physical rotation physiognomic class physiognomic group physiognomic subclass physiognomy physiography physiological character physiologically mature physiology phytocide phytograph phytophagous phytotoxic pick-the-winner selection picnic area piece rate piezometer piezometric surface pine oil pine reproduction weevil ping-pong ball system pinhole pintle hook pioneer pioneer root pistil pistillate pit pitch pitch canker pitch midge pitch tube pitchout pith pixel plaggen epipedon plagiotropism plan plan of attack plan of operations plane-coordinate system planer saw planimeter planimetric map plankton planning planning (long-range) planning (midrange) planning (short-range) planning (site) planning section chief plans chief plant association plant class plant formation plant growth regulator plant health care plant percent plant series plant subclass plant-growth regulator plantation plantation maintenance planting bar planting stock plantlet plasticity platform playa pleiotropism plinthite plot plow line PLSS plug plumule plus plus tree plywood pneumatophore PNW pocket rot pocosin podzolization point point density point sampling point source pollution Poisson distribution polar pole policy pollarding pollen pollen grain pollen tube pollination pollution polyclimax theory polycross polycross test polygene polygon polymix cross polymorphism polypedon polyphagy polyploid population population density pore porosity pot planting potential evapotranspiration potential temperature potential vegetation powderpost beetle powdery mildew practice prairie prairie pothole preattack precipitable water precipitation precipitation gauge precipitation intensity precipitation-evaporation ratio precision precocious precommercial thinning predation predator predator-mediated coexistence predisposition predominant preemergence application premature grazing preparatory cut prescribed burn prescription present net worth preserve pressure bar presuppression prevention prevention guard price deflator price-size curve pricking out primary forest primary growth primary host primary host selection primary insect primary key primary lookout primary meristem primary mineral primary parasite primary pathogen primary root growth prime rate principal component analysis principal host principal point principal species priority animal taxa prism cruising probabilistic model probability processor producer production production population production possibility frontier productivity productivity class profile profit profundal progenic progeny progeny test program program evaluation and review technique programmatic environmental assessment or impact statement programming programming (mathematical) progressive clearcut system projection promycelium propagule proper use factor proper-use factor property rights proprietary jurisdiction protandry protectant protection boundary protection forest protein bank protogyny protoplast protoxylem provenance provenance test pruning pruning lift psammophyte pseudorandom number psychrometric table public domain lands public involvement public land survey system public lands public participation pulaski pulling tops pulp pulping pulpwood punk pupa pupation pure pycniospore pycnium pyrophyte P|E

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