parts per billion
positive pressure breathing
Program Performance Baseline
part period balancing
Personnel Processing Branch
Provisioning Parts Breakdown
Pacific Patrol Boat
Page Position Backward
part per billion
PCI-to-PCI Bridge
Peak performance bouyancy
Peak Performance Buoyancy
permanent prostate brachytherapy
Personnel and Pension Bureau
Pin-Point Bombardment
Planning, Programming, Budgeting
Plans, Program and Budget
plans, program, budget
Plant Population Biology
plasma protein binding
plasmatic protein binding
platelet-poor blood
pleuropulmonary blastoma
pneumococcal pneumonia and bacteremia
Polar Patrol Balloon
polymorphic bands
Portland Police Bureau
Powder Particle Boundary
Power Plant Bulletin
preprophase band