Names
- Newcombe, Frederick Charles, 1858-1927.1
- Newkirk, Henry Wirt, 1854-1946.1
- Novy, Frederick George, 1864-1957.1
- Ogg, Frederic Austin, 1878-1951.1
- Okkelberg, Peter Olaus, 1880-1
- Orr, H. Winnett (Hiram Winnett), 1877-1956.1
- Osborn, Chase S. (Chase Salmon), 18601
- Osborn, Chase S. (Chase Salmon), 1860-1
- Otis, Robert Burns, 1879-1
- Panama Canal.1
- Parker, Edward Foster.1
- Patterson, Robert Porter, 1891-1952.1
- Patton, Carl S. (Carl Safford), 1866-1939.1
- Patton, Carl S. (Carl Safford), 1891-1952.1
- Perkins, Dexter, 1889-1
- Perkins, John A. (John Alanson), 1914-1
- Perkins, John A. (John Alanson), 1914-1982.1
- Peterson, Reuben, 1862-1942.1
- Phelps, William Lyon, 1868-1943.1
- Pillsbury, W. B. (Walter Bowers), 1872-1960.1