Institution
- Pan American Refining Company1
- Paragon Global Services, Ltd.1
- Pasadena Entretec1
- Paul Scherrer Institut1
- Paul, Hastings, Janofsky & Walker LLP1
- Pennsylvania State University. College of Medicine1
- Peplin, Inc.1
- PerSeptive Biosystem1
- Peter Lederman & Associates1
- Peter Petergrinus, Ltd.1
- Petro-Tex Chemical Corporation1
- Petroleum Administration of War1
- Petroleum Recovery Institute1
- Pew Charitable Trusts1
- Pfizer Inc.1
- Philatelia Chimica et Physica1
- Philip Morris Incorporated1
- Phoenix Mutual Life Insurance Company1
- Pittsburgh Consolidated Coal Company1
- Pittsburgh Plate Glass Company1