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(452 classifications)

4-Am An-As At-Bi Bl-Ca Cc-Co Cp-Di Dn-Em En-Fe Fi-Ga Ge-Ha He-Ic Id-In Io-La Le-Ma Mc-Mo Mp-Ne Ng-Pa Pd-Po Pr-Ra Rc-Sa Sc-Sl Sm-St Su-To Tr-Un Up-We Wh-Zo

Classification
Le Corbusier, 1887-1965 (1)
Leadership (4)
League of Nations (1)
Leaning Tower (Pisa, Italy) (1)
Learned institutions and societies (4)
Learning (30)
Learning and scholarship (8)
Learning disabilities (8)
Learning disabled children (4)
Learning, Psychology of (3)
Lease or buy decisions (1)
Leaves (5)
Lebanon (1)
Lectures and lecturing (19)
Lederberg, Joshua (1)
Lee, Robert E. (Robert Edward), 1807-1870. (1)
Lefferts family (1)
Legal assistance to military personnel (1)
Legal assistance to women (1)
Legal composition (2)
Legal documents (8)
Legal ethics (3)
Legal literature (1)
Legal opinions (6)
Legal research (9)
Legal services (2)
Legislation (22)
Legislative auditing (1)
Legislative bodies (14)
Legislative hearings (2)
Legislative histories (3)
Legislative journals (2)
Legislators (13)
Lehman, Herbert H. (Herbert Henry), 1878-1963 (1)
Leicestershire (England) (1)
Leidy, Joseph, 1823-1891. (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)
Lepidoptera (16)
Lepus timidus (1)
Lesbians (6)
Lesson planning (34)
Letter writing (1)
Letterpress printing (1)
Letters (10)
Leucocytes (1)
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)
Liability for environmental damages (1)
Liability for school accidents (1)
Liberalism (Religion) (1)
Liberia (2)
Libertarianism (2)
Liberty (3)
Librarians (16)
Libraries (71)
Libraries and electronic publishing (3)
Libraries and museums (1)
Libraries and the Internet. (4)
Library careers (1)
Library catalogs (7)
Library employees (1)
Library information networks (2)
Library materials (26)
Library of Congress (22)
Library of Congress. Geography and Map Division (2)
Library of Congress. National Digital Library Program (4)
Library records (2)
Library resources (3)
Library schools (2)
Library science (26)
Library statistics. (1)
Library technicians (1)
Libya (3)
License agreements (1)
Lichen-forming fungi (1)
Lichenicolous fungi (1)
Lichens (7)
Lieberman, Joseph I. (1)
Life (8)
Life cycle costing (1)
Life cycles (Biology) (3)
Life expectancy (12)
Life on other planets (17)
Life sciences (74)
Life scientists (4)
Life support systems (Space environment) (1)
Life University (1)
Light (11)
Light art (1)
Light emitting diodes. (1)
Light in architecture (1)
Light pollution (7)
Light Rail Transit Association (Great Britain) (1)
Light sources (8)
Lighthouses (1)
Lighting (12)
Lighting, Architectural and decorative (1)
Lightning (6)
Lignans. (1)
Limnology (14)
Limulus polyphemus. (1)
Lincoln (Neb.) (1)
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)
Linguistics (21)
Linked data (2)
Linux (8)
Lipids (5)
Lippi, Filippo, ca. 1406-1469 (1)
Liquid chromatography. (1)
Lissitzky, El, 1890-1941 (1)
Lists (4)
Literacy (21)
Literacy programs (15)
Literary agents (1)
Literary landmarks (1)
Literary prizes (2)
Literary theory. (2)
Literature (90)
Literature and history (4)
Literature and science (6)
Literature and society (8)
Literature and technology. (3)
Literature publishing (1)
Literature, experimental (2)
Literature, Medieval (10)
Literature, Modern (12)
Lithography. (6)
Little magazines (1)
Little Red Riding Hood (Tale) (1)
Littoral drift (1)
Live television programs (1)
Liver (5)
Liver Cirrhosis (1)
Livestock (6)
Livestock poisoning plants. (1)
Livestock productivity (1)
Living fossils. (2)
Living on Earth (Radio program). (1)
Lizards (3)
Loans (7)
Loans, Personal. (1)
Lobby cards (1)
Lobbying (2)
Lobbyists (1)
Local area networks (Computer networks). (1)
Local foods (1)
Local government (13)
Local history materials (7)
Local laws (1)
Local telephone service (1)
Local transit (11)
Loch Ness monster (1)
Locomotion (2)
Loesser, Frank, -- 1910-1969 (1)
Loesser, Frank, 1910-1969 (2)
Logarithms. (1)
Logbooks (1)
Logging (1)
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) (12)
London (England). East End (1)
London Business School. Centre for Economic Forecasting (1)
Londonderry (Northern Ireland) (1)
Long distance telephone service (1)
Long Island (N.Y.) (1)
Long Now Foundation. (1)
Long Valley Caldera (Calif.) (1)
Longevity (3)
Longfellow, Henry Wadsworth, 1807-1882 (2)
Longitude (1)
Los Alamos National Laboratory (4)
Los Angeles (Calif.) (19)
Los Angeles Examiner (1)
Loss (Psychology) (2)
Lost architecture (1)
Lost articles (1)
Lotteries (1)
Louisiana (17)
Louisiana State University (Baton Rouge, La.) (4)
Lounge music. (1)
Love (2)
Love Canal Chemical Waste Landfill (Niagara Falls, N.Y.) (1)
Love stories (2)
Low temperatures (2)
Low-calorie diet (1)
Low-carbohydrate diet. (2)
Low-income consumers (1)
Low-income housing (12)
Low-intensity conflicts (Military science) (1)
Low-level radiation (1)
Lowell, Robert, 1917-1977 (2)
Lower East Side Tenement National Historic Site (New York, N.Y.) (1)
Lower Manhattan Development Corporation. (1)
Lubricants and lubrication. (1)
Lucent Technologies (Firm) (1)
Ludwig II, King of Bavaria, 1845-1886. (1)
Lully, Jean Baptiste, 1632-1687. (1)
Lumber Trade (2)
Lumbermen (2)
Lunar eclipses (1)
Lunar geology. (2)
Lunar landing sites (1)
Lunar probes (1)
Lunchboxes (3)
Luncheons (1)
Lungs (9)
Lupus (1)
Lustig, Alvin, 1915-1955 (2)
Lyceums (1)
Lyme disease (1)
Lymphomas (4)
Lynching (4)
Lyndon B. Johnson Space Center (1)
Lynx (1)
Macau (China) (3)
Macedonia (Republic) (4)
MacGreevy, Thomas. (1)
Machine ciphers (2)
Machine learning (2)
Machine translating (1)
Machine-tools (2)
Machinery (6)
Macintosh (Computer) (32)
MacLaren, Thomas, 1863-1928 (1)
Macroeconomics (6)
Macromolecules (5)
Madagascar (4)
Madison (Wis.) (7)
Madison Guaranty Savings & Loan Association. (1)
Madison, James, 1751-1836 (1)
Mafia (1)
Magazine covers (2)
Magellan, Ferdinand, d. 1521. (1)
Magi (1)
Magic tricks (4)
Magicians (4)
Magma. (1)
Magna Carta (1)
Magnetic analyzers (Nuclear physics) (1)
Magnetic anomalies (1)
Magnetic circuits (2)
Magnetic fields (7)
Magnetic fluids (1)
Magnetic levitation vehicles (4)
Magnetic resonance (1)
Magnetic resonance imaging (5)
Magnetic storms (3)
Magnetic suspension (4)
Magnetics (6)
Magnetism (23)
Magnetochemistry. (1)
Magnetosphere (2)
Magnetospheric physics (1)
Magnets. (1)
Magnolias (1)
Mahathir bin Mohamad, 1925- (1)
Mahri language (1)
Mail preparation (1)
Maine (6)
Maine Humanities Council (1)
Makerspaces (2)
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 (20)
Mammals, Fossil (3)
Mammoths (1)
Managed care plans (Medical care) (2)
Management (19)
Management information systems (1)
Management science (10)
Managerial economics (1)
Mandela, Nelson, 1918- (1)
Mandela, Nelson, 1918-2013 (1)
Mandelbrot sets. (1)
Mandeville, John, Sir (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 (28)
Manners and customs (1)
Manuals series (1)
Manufactures (9)
Manufacturing (10)
Manufacturing industries (15)
Manufacturing processes (20)
Manures (6)
Manuscripts (19)
Manuscripts (Papyri) (2)
Manuscripts, Arabic (2)
Manuscripts, Greek (1)
Manuscripts, Medieval (13)
Manuscripts, Naxi (1)
Manzanar War Relocation Center. (1)
Mao, Zedong, 1893-1976 (1)
Maori (New Zealand people) (3)
Map collections (14)
Map projection (1)
Map reading (2)
Maple syrup (3)
Maps (77)
Maps -- Early works to 1800. (3)
Maps, Military. (4)
Maps, Tourist (1)
Marbled papers (2)
March (Music) (1)
Marginalia (1)
Marijuana (1)
Marine animals (37)
Marine biological diversity (4)
Marine biology (33)
Marine caves. (1)
Marine debris (1)
Marine ecology (26)
Marine engineering (2)
Marine eutrophication (1)
Marine fishes (9)
Marine geology (1)
Marine geophysics (3)
Marine invertebrates (6)
Marine mammals (20)
Marine meteorology (7)
Marine organisms (13)
Marine parks and reserves (1)
Marine phytoplankton (5)
Marine plants (2)
Marine reptiles, Fossil (1)
Marine resources (5)
Marine resources conservation (15)
Marine sciences (31)
Marine sediments (5)
Mariners' Museum (Newport News, Va.) (1)
Marital status (1)
Market surveys (1)
Marketing (8)
Marketing research (1)
Marlowe, Christopher, 1564-1593 (1)
Maroons (1)
Marquesas Islands (French Polynesia). (1)
Marriage (4)
Marriage customs and rites (1)
Marriage records (2)
Married people (2)
Mars (Planet) (58)
Mars probes. (23)
Marsh, George Perkins, 1801-1882. (2)
Marsh, Reginald, 1898-1954 (1)
Marsupials. (1)
Martial arts (1)
Martians (2)
Marx, Karl, 1818-1883 (1)
Maryland (14)
Masculinity (1)
Masks (1)
Mass media (34)
Mass media and children (3)
Mass media and culture (7)
Mass media and history (1)
Mass media and people with disabilities (1)
Mass media and public opinion (3)
Mass media and teenagers (2)
Mass media and the arts (1)
Mass media and youth (1)
Mass media criticism (2)
Mass media in education (3)
Mass media in religion. (1)
Mass spectrometry. (4)
Mass-wasting (1)
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)
Massachusetts Institute of Technology. School of Science (1)
Massachusetts Medical Society (1)
Massacres (1)
Massage therapy (5)
Materia medica, Vegetable (1)
Material culture (17)
Materials (7)
Materials management (1)
Materials science (46)
Materials testing reactors. (1)
Maternal health services (1)
Mathematical ability (3)
Mathematical analysis (6)
Mathematical instruments (1)
Mathematical literature (3)
Mathematical models (4)
Mathematical notation (3)
Mathematical optimization (9)
Mathematical physics (11)
Mathematical recreations (6)
Mathematical statistics (21)
Mathematicians (31)
Mathematics (481)
Mathematics -- Computer games. (3)
Mathematics in art. (10)
Mathematics teachers (5)
MathML (Document markup language) (1)
Matisse, Henri, -- 1869-1954 (2)
MATLAB (1)
Matrices (4)
Mattapoisett, Mass. (1)
Matter (2)
Matter, Herbert, 1907-1984 (1)
Matting (1)
Mauna Loa (Hawaii Island, Hawaii) (1)
Maximilian, Emperor of Mexico, 1832-1867 (1)
Maxims (1)
May Day (2)
May Day (Labor holiday) (1)
Maya calendar (1)
Mayan languages (2)
Mayas (3)
Mayflies (2)
Mayo Clinic (1)
Mayon, Mount (Philippines) (1)
Mayors (5)