- Morrow, Dwight W. (Dwight Whitney), 1873-1931.2
- Motorboat racing.2
- Motorboats.2
- Musicians.2
- National Broadcasting Company.2
- National Geographic Society (U.S.)2
- Naval art and science.2
- New, Harry S. (Harry Stewart), 1858-1937.2
- Northwest Airlines, inc.2
- Orators.2
- Ortiz Rubio, Pascual, 1877-1963.2
- Owen, Ruth Bryan, 1885-1954.2
- Pan American Union Building (Washington, D.C.)2
- Passersby.2
- Payne, John Barton, 1855-1935.2
- Pennsylvania Avenue (Washington, D.C.)2
- People with disabilities.2
- Physicians.2
- Pittman, Key, 1872-1940.2
- Police--United States.2