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Authors
- Paddock, Robert H. (Robert Hamilton), -19001
- Paine, Martyn, 1794-18775
- Paris, John Ayrton, 1785-18561
- Patterson, Henry S. (Henry Stuart), 1815-18541
- Pereira, Jonathan, 1804-18533
- Peter, Robert, 1805-18942
- Philadelphia College of Pharmacy (1822-1921)1
- Phillips, Benjamin, approximately 1805-18611
- Purple, Samuel S. (Samuel Smith), 1822-1900, author1