Subject
- Petroleum1
- Pharmacy students1
- Philadelphia Board of Trade2
- Philadelphia Society for Promoting Agriculture1
- Phosphoric acid1
- Poggendorff, J. C. (Johann Christian), 1796-18771
- Pollock, James, 1810-18902
- Post, Charles C.1
- Post, Mary A.2
- Powell, John Wesley, 1834-19027
- Precious metals13
- Precious metals--Assaying5
- Precious metals--Refining2
- Preston, Robert E., 1836–191113
- Private clubs6
- Prussian blue1
- Pugh, Evan, 1828-18641
- Quay, Matthew Stanley, 1833-19041
- Rand, B. Howard (Benjamin Howard), 1827-18831
- Real property19