- Purdue University
- Put Yourself in His Place
- Putchock
- Putlitz, Gustav … von und zu
- Putman, Emily James Smith
- Putnam, Frederick Ward
- Putnam, George Haven
- Putnam, George Palmer
- Putnam, Herbert
- Putnam, Israel
- Putnam, John Pickering
- Putnam, Mary Traill Spence Lowell
- Putnam, Rufus
- Putnam, William Le Baron
- Putnam
- Python (mythology)
- Python (serpent)
- Pythoninæ
- Quay, Matthew Stanley
- Raabe, Wilhelm
- Ragnarök
- Ragozin, Zenäide Alexeievna
- Raiffeisen, Friedrich Wilhelm
- Raikes, Robert
- Ramberg, Arthur, Baron
- Ramberg, Johann Heinrich
- Rambler, The
- Ramona
- Rampion
- Rasse
- Rasselas
- Rastatt
- Rat
- Ratisbon
- Ratitæ
- Ratke, Wolfgang
- Raton
- Rattan
- Rattany
- Rattazzi, Marie Studolmine de Solms
- Rattazzi, Urbano
- Rattigan, William Henry
- Rattlesnake
- Rattlesnake root
- Rattlewing
- Rattray, William Jordan
- Rau, Charles
- Rau, Karl Heinrich
- Rauch, Christian Daniel
- Rauhes Haus
- Raum, Green Berry
- Raumer, Friedrich Ludwig Georg von
- Raumer, Karl Georg von
- Raumer, Rudolph von
- Raupach, Ernst Benjamin Salomo
- Raupp, Karl
- Raven, The
- Ravenel, Henry William
- Raymond, John Howard
- Raymond, Rossiter Worthington
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- Realschulen
- Reber, Franz von
- Reber, Napoleon Henry
- Rebisso, Louis T.
- Redondo Beach
- Redonda Island
- Redwood
- Redwood of California
- Reforestation
- Reform Acts
- Reform Bills
- Reform Judaism
- Reform Movements in Politics
- Reformation, The
- Reformatories
- Reformatory Schools
- Reformed Catholic Church
- Reformed Church
- Reformed Church in America, The
- Reformed Church of America, Board of Education of
- Reformed Church in the United States (The)
- Reformed Churches in South Africa
- Reformed Episcopal Church
- Reformed Presbyterian Church
- Regelation
- Regeneration
- Regeneration (zoology)
- Regiomontanus
- Rensselaer (Indiana)
- Rensselaer (New York)
- Rensselaer Polytechnic Institute
- Reorganized Church of J.C. of L.D.S.
- Retzsch, Moritz
- Reuchlin, Johann
- Reuter, Fritz
- Reuter, Paul Julius, Baron
- Reuter Agency
- Reuterdahl, Henry
- Reventlow, Ernst, Count
- Ribault, Jean
- Ribbeck, Johann Karl Otto
- Richter, Johann Paul Friedrich
- Richthofen, Ferdinand, Baron von
- Ricord, John
- Ricord, Philippe
- Riddle, Albert Gallatin
- Riddle, Matthew Brown
- Riddle
- Riders to the Sea
- Ries, Heinrich
- Rikki Tikki Tac
- Riley, Charles Valentine
- Riley, (Isaac) Woodbridge
- Rines, George Edwin
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- Robins, Margaret Dreier
- Robins, Raymond
- Robins, Thomas
- Robinson, Edward (scholar)
- Robinson, Edward (archæologist)
- Robinson, Edward Van Dyke
- Robinson, Edwin Arlington
- Robinson, Theresa Albertine Louise von Jakob
- Robinson Crusoe
- Rogers, Henry Darwin
- Rogers, William Barton
- Rolland, Romaine
- Rondeau
- Ronge, Johannes
- Roon, Albrecht Theodor Emil von
- Roos, Johann Heinrich
- Roosevelt, Nicholas J.
- Roosevelt, Robert Barnwell
- Roosevelt, Theodore
- Roosevelt and the Progressive Party
- Rorer, Sarah Tyson
- Roric figures
- Rosegger, Peter
- Roswitha
- Rotation of Crops
- Rotch, Abbott Laurence
- Roth, Frederick George Richard
- Rotherham
- Rothermel, Peter Frederick
- Rothrock, Joseph Trimble
- Rouget de Lisle, Claude Joseph
- Rowlandson, Mary White
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