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  • Rabbits
  • Rabies
  • Raccoons
  • Race Riots, Detroit, 1943
  • Racism/Racial Discrimination
  • Radar
  • Radiation
  • Radio
  • Radio Astronomy
  • Radium
  • Radon
  • Rafting
  • Railroads
  • Railroads, High Speed
  • Rain
  • Rainbows
  • Rainforests
  • Ramadan
  • Ranching, Farming & Agriculture
  • Rap/Hip Hop Music
  • Raptors
  • Rare Earth Elements
  • Ratios & Proportions
  • Rats
  • Reactions & Equations
  • Reading
  • Reading Comprehension
  • Real Estate & Housing
  • Recommended Daily Allowances (RDA)
  • Reconstruction (U.S. History)
  • Recreation
  • Recycling
  • The Red Cross (American/International)
  • Red Wolf
  • Redwing Blackbird
  • Reference Resources
  • Religion
  • Religious/Gospel Music
  • The Renaissance
  • Repeal of Prohibition, 21st Amendment
  • Reptiles
  • Research (medical)
  • Research Skills
  • The Respiratory System
  • Response to Intervention (RTI)
  • Restless Leg Syndrome
  • Revolution, American
  • Revolution, French
  • Revolution, Mexican
  • Revolution, Russian
  • Revolutions & Revolutionaries
  • Rhinoceros
  • Rhodium
  • Ribosomes
  • Rickets
  • Right Whale
  • Rights: Civil/Human
  • Riverboats
  • Rivers
  • RNA
  • Roads
  • Roanoke Colony
  • Rock & Soils
  • Rodents
  • Rodeo
  • Roller Coasters
  • The Roman Empire/Ancient Rome
  • Romeo & Juliet
  • Rowing
  • The Royal Society
  • Rubber
  • Rubeola (Measles)
  • Rugby
  • Rumba
  • Running (distance)
  • Rural Schools
  • Russell Cave National Monument
  • Russia/Russian Language

  • PLACES


  • Republic of the Congo
  • Rhode Island
  • Rio de Janeiro
  • Ripley County, Indiana
  • Roanoke Colony
  • Romania
  • Rome
  • Rushmore, Mount
  • Russell Cave National Monument
  • Russia/Russian Language
  • Rwanda

  • PEOPLE


  • Ramakrishnan, Venkatraman
  • Ramsay, William
  • Rand, Ayn
  • Raschka, Christopher
  • Rauschenberg, Robert
  • Rawls, Wilson
  • Ray, James Earl
  • Reagan, Ronald
  • Redžepova, Esma
  • Reed, Walter
  • Reeder, Carolyn
  • Rehnquist, William
  • Religious Leaders/Theologians
  • Rembrandt van Rijn
  • Renoir, Pierre-Auguste
  • Revere, Paul
  • Revolutions & Revolutionaries
  • Revueltas, Silvestre
  • Rice, Condoleezza
  • Riddles, Libby
  • Ride, Sally
  • Riley, James Whitcomb
  • Riordan, Rick
  • Rizzi, James
  • Robbe-Grillet, Alain
  • Roberts, Ed
  • Roberts, John G.
  • Robeson, Paul
  • Robinson, Jackie
  • Robinson, Sugar Ray
  • Rockefeller, John D.
  • Rockwell, Norman
  • Roddenberry, Gene
  • Rodgers, Jimmie
  • Rodgers, Mary
  • Rodin, Auguste
  • Röntgen, Wilhelm Conrad
  • Rolling Stones, The
  • Roosevelt, Eleanor
  • Roosevelt, Franklin
  • Roosevelt, Theodore
  • Root, Frederick
  • Ros-Lehtinen, Ileana

  • Ross, Nellie
  • Rossini, Gioacchino
  • Rousseau, Jean-Jacques
  • Rowling, J.K.
  • Rudolph, Wilma
  • Russell, Bertrand
  • Russwurm, John Brown
  • Rutherford, Ernest
  • Ryan, T. Claude
  • Ryden, Hope

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