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(414 classifications)

4-Am An-Ar As-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-O P-Pi Pl-Pr Ps-Re Rh-Se Sh-Sp Sq-Te Th-Un Up-We Wh-Zo

Classification
Rheology (2)
Rhetoric (4)
Rheumatism (2)
Rhinoceroses. (1)
Rhode Island (1)
Ribonucleic acid. (2)
Ribosomes (3)
Ricci, Matteo, -- 1552-1610 (1)
Rice (8)
Rich people (5)
Rich, Adrienne, 1929-2012 (1)
Richard III, King of England, 1452-1485 (1)
Richmond, Virginia (7)
Rickshaws (1)
Right and left (Political science) (2)
Right of property (1)
Right to counsel (1)
Right-wing extremists (2)
Rijksmuseum (Netherlands) (1)
Rings (1)
Riots (1)
Riparian ecology (3)
Risk (1)
Risk management (7)
Risk managers (1)
Risk-taking (Psychology) in adolescence (3)
Rivera, Diego, 1886-1957 (1)
Rivers (31)
RNA. (4)
Road maps (2)
Roads (14)
Roanoke (Va.) (3)
Roanoke Island (N.C.). (1)
Robben Island (South Africa) (1)
Robber flies. (1)
Robert Gould Shaw Memorial (Boston, Mass.) (1)
Robert M. LaFollette Institute of Public Affairs. (1)
Robert Wood Johnson Foundation (2)
Robert, Alain, 1950- (1)
Robinson, Jackie, 1919-1972 (3)
Robinson, William (1)
Robotics (78)
Robots (33)
Robots, Industrial (1)
Rochester (N.Y.) (1)
Rock collectors (1)
Rock films (1)
Rock groups (4)
Rock mechanics (2)
Rock music (11)
Rock musicians (9)
Rock paintings (4)
Rock-forming minerals. (1)
Rockefeller family (1)
Rockefeller, John D. (John Davison), 1839-1937 (1)
Rocketry. (2)
Rockets (Aeronautics) (5)
Rocks (22)
Rocks, Crystalline (1)
Rocks, Igneous (7)
Rocks, Metamorphic. (4)
Rocks, Sedimentary (6)
Rockwell, Norman, 1894-1978 (3)
Rodin, Auguste, 1840-1917. (1)
Rogers, Fred. (1)
Rogers, John, 1829-1904 (1)
Roller coasters (4)
Rollins College (Winter Park, Fla.) (1)
Roman law (1)
Roman numerals (2)
Romanies (1)
Romans (7)
Romanticism (6)
Rome (16)
Rome (Italy) (4)
Ronald Reagan Presidential Library and Museum (2)
Ronne Ice Shelf (Antarctica) (1)
Roofing (1)
Roofs (1)
Roosevelt, Eleanor, 1884-1962 (1)
Roosevelt, Eleanor, 1884-1962. (1)
Roosevelt, Franklin D. (Franklin Delano), 1882-1945 (2)
Roosevelt, Theodore, 1858-1919 (7)
Rosenwald, Lessing J. (Lessing Julius), 1891-1979 (1)
Roses (2)
Rosling, Hans (1)
Ross Ice Shelf. (1)
Rossetti, Christina Georgina, 1830-1894 (1)
Rotational motion (Rigid dynamics). (1)
Route choice (2)
Rowing (1)
Royal Air Force Sealand (Wales) (1)
Royal Botanic Gardens, Kew (3)
Royal Tyrrell Museum of Palaeontology. (1)
RSS feeds (14)
Ruby (Computer program language) (1)
Ruddy Turnstone (1)
Rugby football (2)
Rugs (1)
Rugs, Oriental (2)
Runners (Sports) (1)
Running injuries (2)
Rural conditions (4)
Rural development (27)
Rural development projects (7)
Rural industries (3)
Rural poor (4)
Rural population (2)
Rural populations (6)
Rural roads (1)
Rural schools. (1)
Rural transportation (1)
Rush, Benjamin, 1746-1813 (1)
Russell, Bertrand, 1872-1970 (1)
Russia (17)
Russia (Federation) (36)
Russia (Federation). Federal'noe Sobranie Gosudarstvennaia Duma (1)
Russian Germans (2)
Russian language (1)
Russian literature (1)
Russo-Finnish War, 1939-1940 (2)
Rust (Computer program language) (1)
Rutgers University (1)
Ruth, Babe, 1895-1948 (1)
Rwanda (8)
Saccharomyces cerevisiae (1)
Sacco-Vanzetti Trial, Dedham, Mass., 1921 (1)
Sacred books (6)
Sacred space (2)
Safe places (1)
Safety education (3)
Safety regulations (1)
Sagalassos (Extinct city) (2)
Sagas. (1)
Said, Edward W. (1)
Sailing. (1)
Sails (1)
Saint Augustine (Fla.) (3)
Saint Helens, Mount (Wash.) (4)
Saint Lawrence Seaway (1)
Saint Paul Metropolitan Area (Minn.) (2)
Saint Petersburg (Russia) (2)
Salamanders (2)
Sales accounting. (1)
Saline water conversion (3)
Salinity (1)
Salmon (8)
Salmon fisheries (4)
Salmon fishing (4)
Salmon industry (3)
Salmonella (3)
Salmonellosis. (1)
Salt (1)
Salt industry and trade (1)
Saltspring Island (B.C.) (1)
Salvage (Waste, etc.) (2)
Salvage archaeology. (6)
Same sex marriage (1)
Sampling (Statistics) (2)
San Diego Zoo (2)
San Francisco (Calif.) (15)
San Francisco Bay Watershed (Calif.) (2)
San Francisco Earthquake, Calif., 1906 (2)
San Gabriel Mountains (Calif.). (1)
San Juan Teotihuacan (Mexico) (1)
Sand dunes. (3)
Sandia National Laboratories. (1)
Sanitation Workers Strike, Memphis, Tenn., 1968 (1)
Santa Claus. (1)
Santa Fe Institute (Santa Fe, N.M.) (1)
Santorini Volcano (Greece) (1)
Sargent, John Singer, 1856-1925 (1)
Sarnoff, David, 1891-1971 (1)
SARS (disease) (8)
Saskatchewan (2)
Satellite meteorology (18)
Satellites (13)
Satire in art (3)
Satire, English (1)
Satire, French (2)
Saturn (Planet) (8)
Saturn probes (4)
Saturniidae (1)
Sauerkraut (1)
Saurischia (1)
Savile Row (London, England) (1)
Saving and investment (6)
Savings accounts (1)
Savings and loan association failures (1)
Saxophonists (1)
Scandals (4)
Scandinavia (3)
Scandinavians (2)
Scanning electron microscopy (4)
Scanning probe microscopy (1)
Scattering (Physics) (5)
Scent as a marketing device (1)
Schaeffer, Eric. (1)
Schedules, School (1)
Scheduling (4)
Schenck, Carl Alwin, 1868-1955. (1)
Schizophrenia (1)
Schizophrenics (1)
Schloss Neuschwanstein (Germany) (1)
Schoenberg, Arnold, 1874-1951. (1)
Scholarly electronic publishing (3)
Scholarly electronic publishing. (3)
Scholarly periodicals (12)
Scholarly publishing (13)
Scholars (6)
Scholarships (4)
Scholastic Aptitude Test (1)
Scholder, Fritz, 1937-2005 (1)
Scholes, Myron S. (1)
School administrators. (1)
School attendance (2)
School buildings (1)
School choice (2)
School contests (1)
School crisis management (1)
School discipline (1)
School districts (8)
School employees (3)
School enrollment (4)
School environment (1)
School field trips (1)
School improvement programs (3)
School integration (2)
School librarians (1)
School libraries (6)
School management and organization (7)
School violence (21)
School-to-work transition (1)
Schools (18)
Science (1212)
Science -- Study and teaching -- Computer games. (3)
Science and civilization (3)
Science and industry (2)
Science and psychology (1)
Science and state (13)
Science and the humanities (1)
Science fiction (12)
Science fiction in art (1)
Science fiction radio programs (1)
Science fiction television programs. (2)
Science fiction, American (2)
Science fiction, French (1)
Science fiction, Russian (1)
Science films (2)
Science journalism (1)
Science museums (17)
Science news (32)
Science projects (3)
Science publishing (4)
Science Service (1)
Science teachers (9)
Science television programs (11)
Science writers (1)
Science, Medieval. (1)
Science, Renaissance (1)
Scientific apparatus and instruments (4)
Scientific computing (3)
Scientific expeditions (43)
Scientific films and video (5)
Scientific illustration. (3)
Scientific libraries (5)
Scientific literature (16)
Scientists (106)
Scotland (46)
Scots (1)
Scots pine (1)
Scottish literature (2)
Scottish poetry (6)
Scotts Bluff National Monument (Neb.) (1)
Scrapbooks (2)
Screen savers (Computer programs) (4)
Screenwriters (1)
Scrolls (1)
Scrolls, Chinese (1)
SCSI (Computer bus). (1)
Sculptors (4)
Sculpture (22)
Sculpture, African (3)
Sculpture, American (2)
Sculpture, Ancient (1)
Sculpture, Asian. (1)
Sculpture, Greco-Roman. (1)
Sculpture, Greek. (2)
Sculpture, Medieval (1)
Sculpture, Modern (3)
Sculpture, Roman. (2)
Scurvy (1)
Sea anemones (1)
Sea birds (1)
Sea ice (6)
Sea ice drift (1)
Sea lions (1)
Sea slugs (5)
Sea turtles (10)
Sea urchin embryo (1)
Sea urchins (4)
Sea water (1)
Sea-floor spreading. (3)
Seafaring life (1)
Seafood (2)
Seafood gathering (1)
Sealand (Wales) (3)
Seals (Animals) (1)
Search engines (4)
Sears, Roebuck and Co. (2)
Seashore (1)
Seashore ecology (2)
Seaside architecture (2)
Seasonal Farm Laborers Program (1)
Seasons (5)
Seattle (Wash.) (34)
Seawater (1)
Second City (Theater company) (1)
Second language acquisition (2)
Secondary mortgage market (1)
Secondary recovery of oil (1)
Secularism (1)
Securities (12)
Securities commissions (1)
Securities fraud (2)
Security classification (Government documents) (7)
Security systems (5)
Security, International (13)
Sediment transport (1)
Sedimentary structures (2)
Sedimentation and deposition (7)
Sedimentology (9)
Sediments (Geology) (10)
Seed industry and trade (1)
Seeds (5)
Segregation (20)
Segregation in education. (6)
Seismic networks (7)
Seismology (50)
Seismometry (1)
Selection (Genetics) (2)
Self-care, Health (9)
Self-determination, National (2)
Self-employed (1)
Self-employed women (2)
Self-esteem (1)
Self-help devices for people with disabilities (1)
Self-help groups (1)
Self-management (Psychology) (1)
Self-organizing systems. (1)
Self-perception in adolescence (1)
Self-perception in women (1)
Semantic Web. (2)
Semantics. (2)
Semiconductor industry (3)
Semiconductors (10)
Seminars (1)
Semiotics (5)
Senneferi (1)
Senses and sensation (5)
Sensory neurons (2)
Sentences (Criminal procedure) (3)
Separation (Technology). (1)
Sephardim (1)
Sepiida (1)
September 11 Terrorist Attacks, 2001 (74)
Sequences (Mathematics) (2)
Serbia (1)
Serengeti Plain (Tanzania). (1)
Series, Geometric (1)
Serigraphy (1)
Serigraphy, American (1)
Sermons. (1)
Serpents (1)
Serra, Richard, 1939- (1)
Service industries (4)
Service learning (3)
Sesame Street (Television program) (1)
Seurat, Georges, 1859-1891 (1)
Seuss, Dr. (1)
Seventh-day Adventists (1)
Severe storms (16)
Sewage (2)
Sewerage (4)
Sewing (2)
Sex (1)
Sex and law (1)
Sex Characteristics. (1)
Sex chromosomes (1)
Sex crimes (1)
Sex determination, Genetic. (1)
Sex differences (3)
Sex differences in education (1)
Sex discrimination (1)
Sex discrimination in education (5)
Sex discrimination in employment (7)
Sex discrimination in sports (1)
Sex distribution (Demography) (1)
Sex education (3)
Sex factors in disease. (1)
Sex in mass media. (1)
Sex role (6)
Sex role in literature (1)
Sex role in the work environment (1)
Sexologists (1)
Sexology (2)
Sexton, Anne, 1928-1974 (1)
Sexual abstinence (1)
Sexual harassment (1)
Sexual minorities (13)
Sexual minorities in literature (1)
Sexual minorities' writings (1)
Sexuality (1)
Sexually transmitted diseases (6)