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Author/Creator
- Pallister, John S.3
- Pampeyan, Earl Haig, 1925-3
- Patton, William Wallace, 1923-1
- Pearl, J. E.1
- Pennsylvania. Bureau of Topographic and Geologic Survey1
- Peper, John D.1
- Personius, Stephen F.2
- Pickthorn, Leda Beth G.1
- Pierce, William Gamewall, 1904-1
- Pierson, Charles Thomas, 1918-4
- Pillmore, C. L., 1930-1
- Plafker, George, 1929-2
- Pohn, Howard A.1
- Portugal1
- Pratt, Walden P.1
- Price, E. H.1
- Priest, Susan S.1
- Puerto Rico. Department of Natural Resources3