- Regulus, Marcus Atilius
- Reichsanstalt
- Reid, Thomas
- Reid, Whitelaw
- Reindeer
- Reinecke, Karl
- Rembrandt, Hermanzoon
- Remenyi, Eduard
- Remington, Frederick
- Remora
- Remsen, Ira
- Remusat, Charles François
- Renan, J. Ernest
- Reni, Guido
- Reproduction
- Reptiles
- Republic, Grand Army of the
- Resins
- Resonance
- Respiration
- Respiration, Organs of
- Reszke, Jean de
- Retort
- Réunion
- Reuter, Fritz
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- Ribbon
- Ricardo, David
- Rice
- Richard I
- Richard II
- Richard III
- Richardson, Samuel
- Richelieu, Armand Jean du Plessis, Cardinal Duc de
- Richmond, Ind.
- Richmond, Va.
- Richmond, Leigh
- Richter, Jean Paul Friedrich
- Ricketts, James B.
- Riddles
- Ridley College
- Ridley, Nicholas
- Riel, Louis
- Rienzi, Niccolò Gabrini di
- Rifles
- Riga
- Riggs, Kate Douglas (Wiggin)
- Rigeletto
- Riis, Jacob Augustus
- Riley, James Whitcomb
- Rimini
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- Rinehart, William H.
- Rio de Janeiro
- Rio Grande
- Rio Negro
- Ripley, George
- Rip Van Winkle
- Ristori, Adelaide
- Ritschl, Albrecht
- Ritter, Karl
- Riverside, Cal.
- Rives, Amelia
- Riviera
- Roads
- Roanoke
- Roanoke, Va.
- Robbia, Lucadella
- Robert I
- Robert II
- Robert III
- Roberts, Frederick Sleigh
- Roberston, Frederick William
- Robespierre, Maximilien Marie Isidore
- Robin
- Rob Roy
- Rochambeau, Jean Baptiste Donatien de Vimeure
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