- Labor productivity--United States.1
- Labor unions--United States1
- Labor unions--United States.1
- Limbaugh, Rush H.1
- Liquor industry--Taxation--United States.1
- Lobbying1
- Malnutrition.2
- Mansfield, Mike, 1903-20011
- Mao, Zedong, 1893-19761
- Marine pollution.2
- Marine resources conservation.1
- Marshall, Thurgood, 1908-1993.2
- Mass media1
- Mass media--Law and legislation--United States1
- Mass media--Law and legislation--United States.2
- Mass media--Ownership--United States.2
- Mass media--Political aspects--United States.1
- McCarthy, Joseph, 1908-1957.1
- McGovern, George S. (George Stanley), 1922-1
- Medicare.1