- Potter, William W. (William Warren), 1837-1911, author1
- Powers, Samuel A.1
- Prentiss, D. W. (Daniel Webster), 1843-1899, author1
- Proctor, Richard A. (Richard Anthony), 1837-1888, author1
- Providence (R.I.). Board of Health, author.1
- Pumpelly, Raphael, 1837-1923, author1