Subject
- Paper chemicals1
- Paper chemicals industry1
- Paper coatings1
- Paper coatings industry1
- Parke, Davis & Company1
- Pennsylvania--Bristol1
- Pennsylvania--Myerstown (Lebanon County)1
- Pennsylvania--Philadelphia9
- Pennsylvania--Philadelphia--Bridesburg44
- Pennsylvania--Philadelphia--Independence Mall1
- Pennsylvania--Scranton1
- Pennsylvania--Spring House1
- Pests--Control1
- Pharmaceutical industry4
- Plastics9
- Plastics industry and trade21
- Plexiglas37
- Polymers1
- Quality control3
- Rohm and Haas Company121