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(326 classifications)

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

Classification
DNA (21)
DNA fingerprinting (1)
DNA microarrays (2)
DNA polymerases (4)
DNA replication (2)
Do-it-yourself work (2)
Doctor of philosophy degree (5)
Doctorow, E. L., 1931- (3)
Document imaging systems (1)
Document markup languages (12)
Documentary films (19)
Documentary photography (17)
Documentary radio programs. (6)
Documentary television programs. (18)
Documentary videos (1)
Documents in machine-readable form (4)
Documents libraries (1)
Dog breeds (2)
Dogs. (7)
Dollar, American (2)
Dollar, Canadian (2)
Dolly (Sheep) (3)
Dolphins (6)
Domestic animals (8)
Dominicans (Dominican Republic) (1)
Don Quixote (Fictitious character). (2)
Donation of organs, tissues, etc. (1)
Donne, John, 1572-1631. (1)
Donovan, William J. (William Joseph), 1883-1959. (1)
Doohan, James (1)
Doolittle, James Harold, -- 1896-1993 (1)
Doping in sports (1)
Dormitories Staff (1)
Dou, Gerard, 1613-1675 (1)
Douglas D. Peterson (1)
Douglass, Frederick, 1817?-1895 (4)
Dow Jones industrial averages (4)
Downloading of data (10)
Doyle, Arthur Conan, Sir, 1859-1930 (4)
Dr. Who (Television program). (1)
Dracunculiasis (1)
Draft (1)
Dragonflies (3)
Drake, Francis, Sir, 1540?-1596 (3)
Drama (12)
Drama in education (1)
Dramatists (4)
Drawing (24)
Drawing, American (2)
Drawing, Medieval (1)
Drayton Hall (S.C.) (1)
Dreams (1)
Dressmaking (3)
Drinking of alcoholic beverages (10)
Drinking water (13)
Drive-in theaters (1)
Driveways (1)
Drone aircraft (3)
Drosophila (2)
Drosophila melanogaster (1)
Drought forecasting (1)
Droughts (29)
Drug abuse (20)
Drug abuse and crime (2)
Drug approval (1)
Drug control (1)
Drug resistance in microorganisms (4)
Drug traffic (22)
Drug utilization (1)
Drugs (31)
Drugs of abuse (13)
Drum (3)
Drummers (Musicians) (5)
Dry Tortugas (Fla.) (1)
Dryden, Henry Edward Leigh, Sir (1)
Du Bois, W. E. B. -- (William Edward Burghardt), -- 1868-1963. (2)
Dublin Core (5)
Duchamp, Marcel, 1887-1968 (1)
Ducks (18)
Ducks Unlimited. (1)
Duckweeds (1)
Duggan, Margaret Agnes, -- 1916-2005 (1)
Dumping (International trade) (1)
Dunbar, Paul Laurence, 1872-1906. Poems. Selections. (1)
Duncan, David Douglas, -- 1916- (1)
Dunham, Katherine (1)
Dunkerque (France), Battle of, 1940 (1)
Durable goods, Consumer (1)
Durham (N.C.) (4)
Durkheim, Emile, 1858-1917 (1)
Dust Bowl Era, 1931-1939 (1)
Dutch literature (1)
DVD Forum. (1)
DVDs (5)
Dwellings (21)
Dyes and dyeing (1)
Dylan, Bob, 1941- (1)
Dynamic programming (1)
Dynamics (5)
Dystopias (1)
E-zines (1)
Eames, Charles (1)
Ear (1)
Earhart, Amelia, 1897-1937 (4)
Early childhood education (18)
Early maps (5)
Early printed books (1)
Earned income tax credit (1)
Earth (51)
Earth (Planet) (12)
Earth Day (6)
Earth sciences (218)
Earth Summit II (1997 : New York, N.Y.) (1)
Earth System Science Center (1)
Earth temperature (3)
Earthquake engineering (22)
Earthquake hazard analysis (15)
Earthquake prediction (7)
Earthquakes (139)
Earthquakes and building (8)
Earthworks (Art) (1)
East Asia (14)
East Asian libraries (1)
East London (South Africa) (1)
Easter Island (1)
Eastern State Penitentiary of Pennsylvania (1)
Eating disorders (3)
Ebola virus disease. (1)
eBooks (2)
Echidnas (1)
Echinodermata. (1)
Eclipses (7)
Eco, Umberto. (1)
Ecofeminism (1)
Ecological heterogeneity (1)
Ecological risk assessment (2)
Ecological surveys (2)
Ecologists (2)
Ecology (215)
Ecology in literature (1)
Econometric models (4)
Econometrics (8)
Economic and Social Research Council (1)
Economic and Social Research Council (Great Britain) (3)
Economic assistance (15)
Economic assistance, American (3)
Economic assistance, Domestic (4)
Economic assistance, German (1)
Economic development (183)
Economic development projects (20)
Economic forecasting (26)
Economic geography (3)
Economic history (32)
Economic indicators (51)
Economic policy (45)
Economic sanctions, American (4)
Economic sanctions. (1)
Economic stabilization (16)
Economic surveys (7)
Economics (215)
Economics literature (3)
Economics teachers (1)
Economics, Mathematical (4)
Economists (6)
Ecophysiology (1)
Ecosystem management (56)
Ecotourism (6)
Ecstacy (Drug). (1)
Ecuador (5)
EDGAR (Information retrieval system) (2)
Edison, Thomas A. (Thomas Alva), 1847-1931 (4)
Editing (2)
Editorial cartoons (6)
Education (499)
Education and state (16)
Education in literature (1)
Education policy & development (12)
Education Writers Association (Washington, D.C.) (1)
Education, Bilingual (1)
Education, Compulsory (1)
Education, Elementary (33)
Education, Higher (194)
Education, Humanistic (4)
Education, Primary (3)
Education, Rural (2)
Education, Secondary (47)
Education, Urban (7)
Educational accountability (1)
Educational broadcasting (6)
Educational change (10)
Educational counseling (1)
Educational equalization (1)
Educational evaluation (13)
Educational films (2)
Educational games (17)
Educational indicators (7)
Educational innovations (9)
Educational law and legislation (3)
Educational literature (1)
Educational planning (6)
Educational psychology (6)
Educational Resources Information Center (U.S.) (1)
Educational software. (3)
Educational surveys (11)
Educational technology (177)
Educational tests and measurements (23)
Educational vouchers (1)
Educational Web sites (1)
Educators (1)
Edwards Dam (Me.) (1)
Edwards, Jonathan, 1703-1758. (1)
Eels (1)
Effective teaching (2)
Egypt (57)
Egyptology (3)
EH Strickland Entomological Museum (Edmonton, Alberta) (1)
Ehime Maru (Ship) (1)
Eichmann, Adolf, 1906-1962. (6)
Eigenvalues. (2)
Eighteenth century (1)
Eighth grade (Education) (1)
Einstein field equations (1)
Einstein, Albert, 1879-1955 (9)
Eisenhower, Dwight D. (Dwight David), 1890-1969 (4)
Eisenhower, Mamie Doud, 1896-1979 (1)
El Nino Current (22)
Election law (6)
Election monitoring (2)
Electioneering (5)
Elections (81)
Elections—Statistics (1)
Electoral college (1)
Electric apparatus and appliances (12)
Electric batteries (2)
Electric circuits (1)
Electric engineering. (2)
Electric engineers (2)
Electric fields (1)
Electric generators (2)
Electric lines (1)
Electric motors (1)
Electric power (7)
Electric power consumption (8)
Electric power distribution (2)
Electric power failures (2)
Electric power production (19)
Electric Power Research Institute (1)
Electric power supply, Constant current (2)
Electric power systems (2)
Electric power transmission (4)
Electric power-plants (3)
Electric utilities (14)
Electric wheelchairs (2)
Electric wiring. (1)
Electrical engineering (17)
Electricity (29)
Electrocardiography (1)
Electrochemistry (11)
Electrochemistry, Industrial (2)
Electroluminescent devices. (1)
Electrolyte solutions (1)
Electromagnetic interactions (1)
Electromagnetic waves (2)
Electromagnetism. (3)
Electromechanical devices (1)
Electron gas. (2)
Electron microscopy (16)
Electron-electron interactions. (1)
Electronic apparatus and appliances (9)
Electronic books (34)
Electronic calendars (3)
Electronic circuit design (3)
Electronic circuits (7)
Electronic commerce (45)
Electronic data processing (33)
Electronic digital computers (3)
Electronic directories (1)
Electronic discussion groups (12)
Electronic dissertations (3)
Electronic encyclopedias (7)
Electronic funds transfers (1)
Electronic games (1)
Electronic games industry (2)
Electronic government information (42)
Electronic government publications (1)
Electronic industries (6)
Electronic information resource literacy (4)
Electronic information resource searching (1)
Electronic information resources (9)
Electronic instruments (1)
Electronic journals (52)
Electronic mail messages (39)
Electronic mail systems (59)
Electronic music (5)
Electronic news gathering (12)
Electronic newsletters (6)
Electronic newspapers (13)
Electronic periodicals (2)
Electronic portfolios in education (1)
Electronic public records (1)
Electronic publications (9)
Electronic publishing (23)
Electronic records (1)
Electronic reference services (Libraries) (2)
Electronic reference sources (12)
Electronic spreadsheets (8)
Electronic surveillance (11)
Electronic trading of securities (2)
Electronic voting (4)
Electronic waste (1)
Electronics (26)
Electronics in criminal investigation (1)
Electronics in espionage. (1)
Electronics, Medical (1)
Electrons (5)
Electrotechnology (1)
Elementary schools (3)
Elephant seals (1)
Elephants (1)
Elevators (2)
Eliot, T. S. (Thomas Stearns), 1888-1965. Waste land (1)
Elk (1)
Ellington, Duke, 1899-1974. (2)
Ellis Island Immigration Station (N.Y. and N.J.) (1)
Elsevier Science Publishers (3)
Elvis Presley impersonators (1)