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4-Am An-As At-Bi Bl-Ca Cc-Co Cp-Di Dn-El Em-Fa Fe-Fr Fs-Gr Gu-Hu Hy-In Io-La Le-Ma Mc-Mo Mp-Ne Ng-Pa Pd-Po Pr-Ra Rc-Sa Sc-Sl Sm-St Su-Ti To-Un Up-We Wh-Zo

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Le Corbusier, 1887-1965 (1)
Lead (1)
Leadership (4)
League of Nations (1)
Leaning Tower (Pisa, Italy) (1)
Learned institutions and societies (4)
Learning (31)
Learning and scholarship (8)
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Learning disabled children (4)
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Lebanon (1)
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Lederberg, Joshua (1)
Lee, Robert E. (Robert Edward), 1807-1870. (1)
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Lehman, Herbert H. (Herbert Henry), 1878-1963 (1)
Leicestershire (England) (1)
Leidy, Joseph, 1823-1891. (1)
Leiodidae. (1)
Lemna minor. (1)
Lemurs (1)
Leonard Bernstein Collection, ca. 1920-1989 (1)
Leonard N. Stern School of Business (1)
Leonardo, da Vinci, 1452-1519 (11)
Leopold, Aldo, 1886-1948 (3)
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Lewinsky, Monica S. (Monica Samille), 1973- (1)
Lewis and Clark Expedition (1804-1806) (19)
Lewis, C. S. (Clive Staples), 1898-1963. (1)
Lewis, Meriwether, 1774-1809 (2)
Li, Hongzhi, 1951- (1)
Li, Zhensheng (1)
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Lincoln Memorial (Washington, D.C.) (1)
Lincoln, Abraham, 1809-1865 (31)
Lincoln-Douglas debates, 1858 (2)
Lindley, Walter, -- b. 1852 (1)
Lindsay, John V. (John Vliet) (1)
Lindsley, Lawrence Denny, 1879-1974 (1)
Linear programming. (3)
Linear systems. (1)
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Linux (8)
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Lippi, Filippo, ca. 1406-1469 (1)
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Lissitzky, El, 1890-1941 (1)
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Locke, John, -- 1632-1704 (1)
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Loesser, Frank, -- 1910-1969 (1)
Loesser, Frank, 1910-1969 (2)
Logarithms. (1)
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Logic (21)
Logic circuits. (2)
Logic design. (1)
Logic programming (Computer science) (4)
Logic, Symbolic and mathematical (3)
Logography (1)
Lomax, John Avery, 1867-1948. (1)
Lomax, Ruby T. (Ruby Terrill). (1)
London (England) (24)
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Long Now Foundation. (1)
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Longfellow, Henry Wadsworth, 1807-1882 (2)
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Los Alamos National Laboratory (4)
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Love Canal Chemical Waste Landfill (Niagara Falls, N.Y.) (1)
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Lowell, Robert, 1917-1977 (2)
Lower East Side Tenement National Historic Site (New York, N.Y.) (1)
Lower Manhattan Development Corporation. (1)
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Ludwig II, King of Bavaria, 1845-1886. (1)
Lully, Jean Baptiste, 1632-1687. (1)
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Lustig, Alvin, 1915-1955 (2)
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Lyndon B. Johnson Space Center (1)
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MacGreevy, Thomas. (1)
Machine ciphers (2)
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Macintosh (Computer) (49)
MacLaren, Thomas, 1863-1928 (1)
Macroeconomics (6)
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Madagascar (4)
Madison (Wis.) (7)
Madison Guaranty Savings & Loan Association. (1)
Madison, James, 1751-1836 (1)
Mafia (1)
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Magellan, Ferdinand, d. 1521. (1)
Magi (1)
Magic tricks (4)
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Magna Carta (1)
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Magnetic levitation vehicles (4)
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Magnetic resonance imaging (5)
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Magnetic suspension (4)
Magnetics (6)
Magnetism (23)
Magnetochemistry. (1)
Magnetosphere (2)
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Magnets. (1)
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Mahathir bin Mohamad, 1925- (1)
Mahri language (1)
Mail preparation (1)
Maine (6)
Maine Humanities Council (1)
Makerspaces (3)
Making Medicine (1)
Malaria (20)
Malaria vaccine. (2)
Malaysia (2)
Male rape (1)
Mall, The (Washington, D.C.) (1)
Mallard (4)
Malnutrition in children (2)
Mammalogy (2)
Mammals (51)
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Mammoths (1)
Managed care plans (Medical care) (2)
Management (29)
Management information systems (1)
Management science (10)
Managerial economics (1)
Mandela, Nelson, 1918- (1)
Mandela, Nelson, 1918-2013 (1)
Mandelbrot sets. (1)
Mandolin music (1)
Manet, Edouard, 1832-1883. (1)
Mangrove ecology. (1)
Mangrove plants (3)
Mangrove swamps (1)
Manic-depressive illness (1)
Manipulatives (Education) (1)
Manned space flight (30)
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Manufactures (11)
Manufacturing (10)
Manufacturing industries (27)
Manufacturing processes (20)
Manures (6)
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Manuscripts, Greek (1)
Manuscripts, Medieval (13)
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Manzanar War Relocation Center. (1)
Mao, Zedong, 1893-1976 (1)
Maori (New Zealand people) (2)
Map collections (14)
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Map reading (2)
Maple syrup (3)
Maps (135)
Maps -- Early works to 1800. (3)
Maps, Military. (4)
Maps, Tourist (1)
Marbled papers (2)
March (Music) (1)
Marijuana (1)
Marine animals (40)
Marine biological diversity (4)
Marine biology (62)
Marine caves. (1)
Marine ecology (32)
Marine engineering (2)
Marine eutrophication (1)
Marine fishes (9)
Marine geology (1)
Marine geophysics (3)
Marine invertebrates (6)
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Marine organisms (13)
Marine parks and reserves (2)
Marine phytoplankton (5)
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Marine reptiles, Fossil (1)
Marine resources (5)
Marine resources conservation (20)
Marine sciences (61)
Marine sediments (5)
Mariners' Museum (Newport News, Va.) (1)
Marital status (1)
Market surveys (1)
Marketing (13)
Marketing research (1)
Marlowe, Christopher, 1564-1593 (1)
Marquesas Islands (French Polynesia). (1)
Marriage (4)
Marriage customs and rites (1)
Marriage records (2)
Married people (2)
Mars (Planet) (110)
Mars probes. (23)
Marsh, George Perkins, 1801-1882. (2)
Marsh, Reginald, 1898-1954 (1)
Marsupials. (2)
Martial arts (1)
Martians (2)
Marx, Karl, 1818-1883 (1)
Maryland (14)
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Masks (1)
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Mass spectrometry. (4)
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Massachusetts (37)
Massachusetts Institute of Technology (6)
Massachusetts Institute of Technology. Microsystems Research Center (2)
Massachusetts Institute of Technology. Research Laboratory of Electronics (1)
Massachusetts Institute of Technology. Research Laboratory of Electronics. (1)
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Material culture (17)
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Materials science (46)
Materials testing reactors. (1)
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Mathematical physics (11)
Mathematical recreations. (7)
Mathematical statistics (35)
Mathematicians (32)
Mathematics (1139)
Mathematics -- Computer games. (3)
Mathematics in art. (10)
Mathematics teachers (9)
MathML (Document markup language) (1)
Matisse, Henri, -- 1869-1954 (2)
MATLAB (1)
Matrices (4)
Mattapoisett, Mass. (1)
Matter (2)
Matter, Herbert, 1907-1984 (1)
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Mauna Loa (Hawaii Island, Hawaii) (1)
Maximilian, Emperor of Mexico, 1832-1867 (1)
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Mayors (5)