- Maria Louisa
- Maria Theresa
- Mariazell
- Marie Antoinette
- Marie Antoinett, Josephe Jeanne
- Marietta
- Marigold
- Marine Corps
- Marinette
- Mario, Giuseppe
- Marion, Francis
- Marion, Ind.
- Marion, Ohio
- Marius, Gaius
- Marjaram
- Marjorie Fleming
- Mark
- Mark Antony
- Markham, Edward
- Mark Twain
- Marl
- Marlboro, Mass.
- Marlborough, John Churchill
- Marlitt, E.
- Marlowe, Christopher
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- Marlowe, Julia
- Marmion, Lord
- Marmont, Auguste Frederic Louis Viesse de
- Marmora, Sea of
- Marmoset
- Marmot
- Maroons
- Marque and Reprisal, Letters of
- Marquesas Islands
- Marquette, Jacques
- Marquette
- Marryat, Frederick
- Mars (mythology)
- Mars (planet)
- Marseillaise La
- Marseilles
- Marsh, George Perkins
- Marshall, Thomas Riley
- Marshall, John
- Marshalltown
- Marshmallow
- Marston Moor
- Marston, Philip Bourke
- Marsupials
- Marten
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- Martha
- Martha's Vineyard
- Martial Law
- Martial, Marcus Valerius Martialus
- Martin
- Martineau, Harriet
- Martineau, James
- Martinique
- Marvel, Ik
- Marx, Karl
- Mary the Virgin
- Mary I of England
- Mary II of England
- Mary Magdalene
- Mary Queen of Scots
- Maryland
- Maryland, my Maryland
- Masaccio, Tommaso Guidi
- Masaniello
- Mascart, Eleuthere Elie N.
- Mashonaland
- Mason and Dixon's Line
- Mason, George
- Mason, James Murray
- Mason, Lowell
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- Masons
- Mass
- Massachusetts
- Massachusetts Indians
- Massachusetts Institute of Technology
- Massasauga
- Massasoit
- Masséna, André
- Massillon, Jean Baptiste
- Massillon
- Mastiff
- Mastodon
- Matabeleland
- Matamoros, Mariano
- Matanzas
- Matapediac River, Quebec
- Matches
- Mather, Cotton
- Mather, Increase
- Matheson, Most Reverend Samuel P.
- Mathew, Theobald
- Mathieu, Olivier Elzear
- Matsys, Quentin
- Matterhorn
- Matthew
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