Subject
- Ores--Sampling and estimation1
- Organic compounds--Synthesis1
- Očhéthi Šakówiŋ1
- Pennsylvania College. Phrenakosmian Society1
- Pennsylvania Hospital (Philadelphia, Pa.)1
- Pennsylvania Institution for the Instruction of the Blind1
- Petroleum1
- Pharmacy students1
- Philadelphia Society for Promoting Agriculture1
- Phosphoric acid1
- Poggendorff, J. C. (Johann Christian), 1796-18771
- Post, Charles C.1
- Prussian blue1
- Pugh, Evan, 1828-18641
- Quay, Matthew Stanley, 1833-19041
- Rand, B. Howard (Benjamin Howard), 1827-18831
- Remsen, Ira, 1846-19271
- Rent1
- Richardson, William A. (William Adams), 1821-18961
- Ringwalt, J. Luther (John Luther)1