- Rochefort, Victor Henri
- Rochelle, La
- Rochester, N. H.
- Rochester, N. Y.
- Rockefeller, John Davidson
- Rocket
- Rockford, Ill.
- Rocking-Stones
- Rock Island, Ill.
- Rock River
- Rocks
- Rocky Mountains
- Rocky Mountain Goat
- Rodents
- Rodgers, John
- Rodin, Auguste
- Rodman, Thomas J.
- Rodrigues
- Roemer, Ole
- Roentgen Rays
- Roentgen, Wilhelm Konrad
- Rogers, Henry Wade
- Rogers, John
- Rogers, Randolph
- Rogers, Samuel
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- Rojestvenski, Sinovi Petrovich
- Roland
- Roland, Marie Jeanne Philipon
- Roller-Skate
- Rolin, Charles
- Romagna
- Roman Empire
- Romance
- Romanes, George John
- Romanoff, The House of
- Rome, Ga.
- Rome
- Rome, N. Y.
- Romeo and Juliet
- Romola
- Romulus
- Roosevelt, Theodore
- Root
- Root-Cap
- Root, Elihu
- Root, George Frederick
- Root-Hair
- Root-Pressure
- Rootstock
- Root-Tubercles
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- Ropes
- Rose
- Rosebery, Archibald Philip Primrose
- Rosecrans, William Starke
- Roses, Wars of the
- Rosetta Stone
- Rosin
- Roslin
- Ross, George W.
- Ross, James Clark
- Ross, John
- Rossetti, Christina Georgina
- Rossetti, Dante Gabriel
- Rossetti, Gabriele
- Rossini, Gioacchino
- Rossland, Can.
- Rotation of Crops
- Rothschilds
- Rotifers
- Rotterdam
- Rouen
- Rouge River, Quebec, Can.
- Rough Riders
- Round Table, The
- Rousseau, Jean Baptiste
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- Rousseau, Jean Jacques
- Rousseau, Lovell Harrison
- Rousseau, Pierre Étienne T.
- Rowan Tree
- Rowland, Henry Augustus
- Royal Canadian Academy, The
- Royal Military College
- Royal Society of Canada, The
- Rubber Manufacture
- Rubens, Peter Paul
- Rubicon
- Rubinstein, Anton Gregor
- Ruble
- Ruby
- Ruff
- Ruffini, Giovanni
- Rugby
- Rugs, Oriental
- Rum
- Rumania
- Rumelia
- Rumford, Count
- Ruminant
- Runeberg, Johann Ludvig
- Runner
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