Subject
- Owen, Richard, 1804-18922
- Paint materials2
- Painting, Industrial2
- Periodic law2
- Periodic table of the elements2
- Perkin, William Henry, Sir, 1838-19072
- Pesticides2
- Pharmaceutical chemistry2
- Phosgene2
- Phosphates2
- Photochemistry2
- Photographic chemistry2
- Photography--Printing processes--Silver2
- Plastics2
- Poisons2
- Public health2
- Quacks and quackery2
- Radioactive fallout2
- Radioactivity2
- Radiography2