Preliminary Design Review 
Public Document Room 
Preliminary Design Reviews 
Preferential Departure Route 
Program Design Review 
Photo Dissociation Region 
Priority Data Reduction 
Physician's Desk Reference 
Precision Depth Recorder 
pressurized deuterium reactor 
Program Director's Review 
proliferative diabetic retinopathy 
Particulate Data Reduction 
People's Democratic Republic 
Personal Development Review 
photon-dominated region 
Physicians Desk Reference 
Physicians' Desk Reference 
Physicians drug reference 
Power Directional Relay 
PRELIMINARY DATA REPORT 
Preliminary Data Requirements 
Process Description Report 
Processed Data Recorder 
Professional Development Review 
Program Deviation Report 
Program Drum Recording 
Property disposal request 
Purchase of Development Rights 
COMAV