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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

Classification
Reaction time (3)
Readiness for school (3)
Reading (27)
Reading (Elementary) (10)
Reading (Higher education) (1)
Reading (Kindergarten) (3)
Reading (Preschool) (4)
Reading (Secondary) (3)
Reading interests (2)
Reading promotion (8)
Reading readiness (3)
Ready-reckoners (1)
Reagan, Ronald (9)
Real estate business (4)
Real estate development (5)
Real estate investment (4)
Real property (5)
Real-time data processing (1)
Realism in art (2)
Reality television programs. (1)
Reasoning (4)
Recessions (5)
Recidivism. (1)
Recipes (29)
Reciprocity (1)
Reconciliation (1)
Reconnaissance aircraft. (2)
Reconstruction (U.S. history, 1865-1877) (4)
Recreation (1)
Recreation areas (3)
Recruiting and enlistment (1)
Recurrent sequences (Mathematics). (1)
Recycling (Waste, etc.) (12)
Red giants (1)
Red kite. (1)
Redon, Odilon, 1840-1916 (2)
Reduced gravity environments (7)
Reducing diets (2)
Redwood (Wood) (1)
Reed, Henry, 1884-1968 (1)
Reef ecology (3)
Reference librarians (2)
Reference services (Libraries) (3)
Reform Party (U.S.) (1)
Refrigeration and refrigerating machinery (1)
Refugee property (2)
Refugees (35)
Refugees, Political (8)
Refuse and refuse disposal (5)
Regattas (2)
Regional economics (7)
Regional planning (8)
Registers of births, etc. (4)
Regression analysis (1)
Rehabilitation technology (2)
Relational databases. (1)
Relativity (Physics) (8)
Relief printing (4)
Religion (44)
Religion and culture (20)
Religion and law (2)
Religion and politics (5)
Religion and science (11)
Religion and state (2)
Religion and the press (2)
Religions (29)
Religious communities (2)
Religious education (2)
Religious ethics (4)
Religious fundamentalism (2)
Religious groups (4)
Religious literature (7)
Religious literature, American (1)
Religious minorities (2)
Religious pluralism (1)
Religious services industry (1)
Rembrandt Harmenszoon van Rijn, 1606-1669 (4)
Remedial teaching (1)
Remote sensing (20)
Remote-sensing images (12)
Remote-sensing maps (2)
Renaissance (8)
Renaissance -- Italy -- Florence -- Sources (1)
Renaissance, Art (8)
Renewable energy options (4)
Renewable Energy Policy Project (1)
Renewable energy sources (48)
Reno (Nev.) (1)
Rental housing (3)
Repairing (1)
Repetitive patterns (Decorative arts) (2)
Report writing (5)
Reporters and reporting (12)
Reporters sans frontières (Association) (1)
Representative government and representation (7)
Reproduction (1)
Reproductive health (7)
Reproductive medicine (2)
Reptiles (11)
Reptiles, Fossil (6)
Republican National Committee (U.S.) (1)
Republican Party (U.S. : 1854- ) (1)
Requests for proposals (Public contracts) (2)
Rescues. (1)
Research (88)
Research and development contracts, Government (3)
Research grants (19)
Research institutes (43)
Research libraries (9)
Research teams (1)
Research vessels (1)
Research, Industrial (4)
Residential mobility (1)
Residents (Medicine) (1)
Resorts (2)
Resource programs (Education) (1)
Resources for the Future (2)
Respiratory intensive care (1)
Respiratory organs (18)
Responsibility (1)
Restaurant management (2)
Restaurants (4)
Restitution and indemnification claims (1933- ) (1)
Restitution and indemnification claims (1933-) (1)
Restoration ecology (9)
Resumes (Employment) (3)
Retail trade (4)
Retail trade surveys (1)
Retina (1)
Retirees (4)
Retirement (9)
Retirement income (7)
Return migration (3)
Return of the Jedi (Motion picture) (1)
Revenue (5)
Reverón, Armando, 1889-1954 (1)
Reverse discrimination (1)
Revolutions (3)
Reynolds, Mary Louise (2)
Reynolds, Roger, 1934- (2)
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 (80)
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 (3)
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)
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 (8)
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 (17)
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)
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.) (1)
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)