perc - piez
- percent distortion
- percent frequency effect
- percentage
- percentage deviation
- perched water table
- percolation
- percolation indicator
- percolation pit
- percolator
- percussion action
- percussion bit design
- percussion core
- percussion cutting
- percussion drill
- percussion drilling
- percussion hole
- percussion rock
- percussion system
- percussion test hole
- percussion tool
- percussive action
- percussive cutter
- percussive cutting machine
- percussive drilling
- percussive edge
- percussive machine
- percussive machine drilling
- percussive mechanism
- percussive-rotary drilling
- perennially frozen sediments
- perfect correlation
- perfect dielectric
- perfect elasticity
- perfect insulator
- perfect null
- perfect screen
- perfectly conducting earth
- perfectly conducting medium
- perfectly conducting scatterer
- perfectly dielectric earth
