Browse the Concise Encyclopedia
- roncesvalles, battle of
- rondeau
- rondo
- ronin
- roof
- roof pendant
- rook
- roosevelt island
- root
- rope
- rorqual
- rosary
- rose
- rose bowl
- rose of sharon
- rose quartz
- rose window
- roseau
- rosemary
- roses, wars of the
- rosetta stone
- rosh hashanah
- rosicrucian
- ross ice shelf
- rotary engine
- rotary press
- rothschild family
- rotifer
- rottweiler
- rotunda
- rough rider
- roulette
- roussillon
- router
- rowing
- royal academy of arts
- royal air force (raf)
- royal ballet
- royal canadian mounted police
- royal dutch shell plc
- royal greenwich observatory
- royal national theatre
- royal shakespeare company (rsc)
- royal society (of london for improving natural knowledge)
- ru-486
- ruanda-urundi
- rub' al-khali
- rubber
- rubber plant
- rubber tree
- rubella
- rubicon
- rubidium-strontium dating
- rubrication
- ruby
- rue family
- ruffed grouse
- rug and carpet
- rugby
- ruhr occupation
- rukwa, lake
- rum
- ruminant
- rummy
- rune
- runic writing
- rupa-loka
- rupert's land
- rural electrification
- rusalka
- rush
- russell cave national monument
- russell family
- russian civil war
- russian language
- russian orthodox church
- russian revolution of 1905
- russian revolution of 1917
- russian social-democratic workers' party
- russo-finnish war
- russo-japanese war
- russo-turkish wars
- rustication
- rutabaga
- ruthven family
- rutile
- ryder cup
- rye
- rye house plot
- ryerson polytechnic university
- ryoan temple
- ryukyu islands