- McGovern, George S. (George Stanley), 1922-1
- Medicare.1
- Mills, Wilbur D. (Wilbur Daigh), 1909-19921
- Mississippi.1
- Murdoch, Rupert, 1931-1
- My Lai Massacre, Vietnam, 19681
- National Association for the Advancement of Colored People.1
- National Governors' Association.1
- National Security Council (U.S.)1
- National parks and reserves1
- National security--United States--Decision making.1
- Natural gas--United States.1
- New York (N.Y.)--History--1951-1
- Nixon, Richard M. (Richard Milhous), 1913-1994--Impeachment1
- North Atlantic Treaty Organization1
- Nunn, Sam.1
- Obscenity (Law)--United States1
- Offshore oil industry.1
- Orangeburg-Calhoun Technical College.1
- Organization of Petroleum Exporting Countries.1