PP

1. Partial Pressure (or Peak Pressure) Contributor: CASI

2. Particle Physics (or Particle Production) Contributor: CASI

3. peak-to-peak Contributor: LaRC

4. Pilot Project Contributor: CASI

5. Planetary Programs Contributor: CASI

6. Plasma Protein Contributor: CASI

7. Polypeptide Contributor: CASI

8. Polypropylene Contributor: CASI

9. Pounds Pressure Contributor: CASI

10. Project Plan Contributor: GSFC

11. Propulsion Power Contributor: CASI

12. Proton Proton Contributor: CASI