Names
- Munro, William Bennett, 1875-1957.1
- Murrow, Edward R.1
- Newberry, Truman Handy, 1864-1945.1
- O'Brien, Patrick H. (Patrick Henry), 1868-1959.1
- O'Brien, Patrick Henry, 1868-1
- O'Hara, John J., 1885-1
- Ogg, Frederic Austin, 1878-1951.1
- Olds, Ransom Eli, 1864-1950.1
- Osborn, Chase S. (Chase Salmon), 1860-1
- Osborn, Chase S. (Chase Salmon), b. 1860.1
- Panama Canal.1
- Perkins, Dexter, 1889-1
- Perkins, Frances, 1880-1965.1
- Perkins, Frances, 1882-1965.1
- Person, Seymour Howe, 1879-1957.1
- Pinchot, Gifford, 1865-1946.1
- Pollock, James Kerr, 1898-1
- Pollock, James Kerr, 1898-1968.1
- Potter, William W., 1869-1940.1
- Ray, P. Orman (Perley Orman), 1875-1