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- Rasalhague Raschig ring Rasht Rask Raskolnik Rasmussen Rasores Rasputin Rassenkreis Rasta Rastafarian Rastafarianism Rat Islands Ratak Ratana Church Ratibida Ratitae Raton Ratufa Rauraci Rauschenberg Rauschquinte Ravenelia Ravenna Ravenna grass Ravensara Rawalpindi Rawl Rawlinson Ray's woodsia Rayburn Rayleigh Rayleigh disk
- Rayleigh equation Rayleigh scattering Rayleigh wave Rayleigh-Jeans law Raytown RdAc RdTh Reade Reagan Realtor Rebekah Rebelo de Sousa Rebild Reblochon Reboulia Received Pronunciation Received Standard Receptaculida Receptaculites Receptaculitidae Rechabite Rechabitism Recife Recklinghausen Recuay Recurvirostra Red Book Red Cloud Red Crescent Red Cross Red Delicious Red Feather Red Guard
- Red Hand Red Indian Red River maple Red Sea Red Sea Hills Red Square Red Volta Red for Lake Redbridge Reddi Redding Redemptionist Redemptorist Redgrave Redjang Redlands Redmond Redondo Beach Redunca Redwood City Redwood National Park Reelfoot Reeve's pheasant Refection Sunday Reform Jew Reform Judaism Refreshment Sunday Regalecidae Regalecus Regensburg Regga Reggane Reggiano