Authors: 1900
- Pepper, John Henry 1821-1900
- Peterson, P. D. (Purl Dewey) 1900-1967
- Phelan, Earl W. 1900-1993
- Pinto, Alexandre Alberto da Rocha de Serpa 1846-1900
- Pitt-Rivers, Augustus Henry Lane-Fox 1827-1900
- Pyle, Ernie 1900-1945
- Queirós, Eça de 1845-1900
- Rabbe, Félix -1900
- Räikkönen, Erkki 1900-1961
- Rançon, A. (André) 1858-1900
- Rand, Theodore H. (Theodore Harding) 1835-1900
- Ranger, Robin 1827-1900
- Raplee, Elizabeth Virginia 1900-1982
- Rayleigh, Clara, Lady -1900
- Repp, Ed Earl 1900-1979
- Reuther, Antoine Charles 1824-1900
- Ridpath, John Clark 1840-1900
- Riou, Edouard 1833-1900
- Robinson, Rowland Evans 1833-1900
- Rodwell, J. M. (John Medows) 1808-1900
- Ruhle, George Cornelius 1900-
- Ruskin, John 1819-1900
- Ryle, J. C. (John Charles) 1816-1900
- Sancho Rayón, José León 1830-1900
- Saunders, William 1822-1900
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