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Chapter 4.
- Holland-America (steamship)
- Maginot (fortification)
- line:
- Mason-Dixon line or Mason and Dixon's line
- State
- listserv
- Local:
- Columbia Typographical Union, Local 101
- International Brotherhood of Electrical Workers Local 180; but local No. 180
- local time, local standard time (see time)
- locator service
- Loop, the (see cities)
- Louisiana Purchase
- Low Church
- Lower, if part of name:
- California (Mexico)
- Colorado River Basin
- Egypt
- Peninsula (of Michigan)
- lower:
- 48 (States)
- House of Congress
- Mississippi
- M
- Madam:
- Chair
- Chairman
- Chairwoman
- Magna Carta
- Majesty, His, Her, Your; Their Majesties
- Majority Leader Reid; Majority Leader Hoyer; but the majority leader (U.S. Congress)
- Mall, The National; The Mall (District of Columbia)
- Mansion, Executive (see Executive)
- map 3, A, II, etc.; but Map 2, when part of title: Map 2.—Railroads of Middle Atlantic States
- mariculture
- Marine Corps; the corps:
- Marines (the corps); but marines (individuals)
- Reserve; the Reserve
- also a marine; a woman marine; the women marines (individuals); soldiers, sailors, coastguardsmen, and marines
- Maritime Provinces (Canada) (see Province)
- Marshal (see Supreme Court)
- marshal (U.S.)
- medals (see decorations)
- Medicaid
- MediCal
- Medicare Act; Medicare plan
- Medicare Plus
- Medicare Program
- Medigap
- Member, if referring to Senator, Representative, Delegate, or Resident Commissioner of U.S. Congress; also Member at Large; Member of Parliament, etc.; but membership; member of U.S. congressional committee
- Memorial:
- Jefferson
- Lincoln
- Vietnam
- WWII
- Korean
- Franklin D. Roosevelt etc.; the memorial
- Merchant Marine Reserve; the Reserve; but U.S. merchant marine; the merchant marine
- Metroliner
- Metropolitan Washington, etc.; but Washington metropolitan area
- midcontinent region
- Middle Ages (see Ages)
- Middle Atlantic States
- Middle East; Mideast; Mideastern; Middle Eastern (Asia)
