- Robert Tristram Coffin, Poet
- Robin
- Robins’ Balistic Pendulum
- Rock disintegration in the Sahara
- Rock of Ages 2
- Rocky Mountain men setting traps
- Rocky Mountain Sheep
- Rodeo Rider
- Roe deer
- Roger Bacon
- Roger Bacon's House at Oxford
- Roger Bacons diagram of the Eye
- Roger Williams on his Way to Visit the Chief of the Narragansett Indians
- Roger Williams's Meeting-House
- Roller Washing Machine
- Rolling on the crimson rug
- Romain Rolland
- Roman
- Roman As
- Roman Atrium
- Roman Bath in the Strand
- Roman Coin Celebrating the Victory over Pyrrhus
- Roman Empire at Death of Augustus
- Roman Empire in Time of Trajan
- Roman Galley
- Roman General
- Roman girl and tibia
- Roman London
- Roman Power after the Samnite Wars
- Roman Power, 50 B.C.
- Roman Soldiers
- Roman Soldiers
- Roman Soldiers
- Roman Soldiers and a Jew
- Roman Soldiers Leaving Britain
- Roman Soldiers on Bridge of boats
- Roman temple (maison carrée) in Nîmes
- Roman Trophies
- Roman Trophies
- Roman trumpets
- Romans Landing
- Romans teaching the Britons to Build
- Rome and its Alliances, 150 B.C.
- Rome dominating the world.
- Room to pass
- Roosevelt Poster
- Rooster
- Rooster divider
- root and stem and leaves of the young oak
- root of a beet plant
- Rope Bridge
- Rope Frame
- Rope-geared hydraulic freight elevator
- Rose
- Rose Frame
- Rose Hip cut lengthwise to show the seeds
- Rose Rolando
- Rose-Red's mamma gathered her up in her arms and comforted her
- Rostro-carinate or Eagle-beak Flint Implement
- Rot at Mouldering Wharves