Doctor of Philosophy
Port Hueneme Division
Per Hatch Per Day
Personal Health Data
Pocket Hard-disk
Port Huron and Detroit Railroad
Power Hybrid Doubler
Pulse Height Discriminators
Doctor of Philosophy degree
Doctor of Philosophy in Education
Duncan Aviation
IATA code for Harry Clever Field, New…
Parallel Head Disk
Parallel Hybrid Device
pathological habit disorder
Permanent Hold
Phage Host Defective
Phase History Data
Philosophiæ Doctor
Philosophiae Doctor
Philosophical Doctor
Phosducin
Photoelectron Diffraction
Phreak/Hacker Destroyers
Physical Hydrology Division
Piled Higher and Deeper
Pioneer Floating Rate Trust
plant homeo domain
plant homeo domains
Playa Hatin Degree