Authors: 1904
- Phillips, Morris 1834-1904
- Piper, H. Beam 1904-1964
- Pittenger, William 1840-1904
- Platts, John T. (John Thompson) 1830-1904
- Pont-Jest, René de 1830-1904
- Poore, George Vivian 1843-1904
- Porter, Charles W., III (Charles Wesley) 1904-1987
- Powell, F. York (Frederick York) 1850-1904
- Pozzi, Ernesto 1843-1904
- Quiroga, Adán 1863-1904
- Rauanheimo, Yrjö 1904-1949
- Reclus, Élie 1827-1904
- Rhoides, Emmanouel D. 1835-1904
- Risley, R. V. (Richard Voorhees) 1874-1904
- Robinson, Forbes 1867-1904
- Rogers, Robert M. 1839-1904
- Ryder, J. F. (James Fitzallan) 1826-1904
- Saul, Jack 1857-1904
- Schreiber, Leo J. 1904-1992
- Scott, Clement 1841-1904
- Seiss, Joseph Augustus 1823-1904
- Seppänen, Unto 1904-1955
- Sergeant, Adeline 1851-1904
- Shewell, Livingston Robert 1833-1904
- Simak, Clifford D. 1904-1988
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