Authors: 1951
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- Ovington, Mary White 1865-1951
- Palola, Eino 1885-1951
- Pekkarinen, Tatu 1892-1951
- Pellett, Frank C. (Frank Chapman) 1879-1951
- Perrot, Em. (Emile) 1867-1951
- Pfister, Kurt 1895-1951
- Phillips, Everett Franklin 1878-1951
- Phillips, Henry Albert 1880-1951
- Piha, Waldemar 1882-1951
- Pissarro, Esther 1870-1951
- Plan, Pierre-Paul 1870-1951
- Power, P. (Patrick) 1862-1951
- Prestage, Edgar 1869-1951
- Price, Norman 1877-1951
- Ramsden, Hermione Charlotte 1867-1951
- Richards, G. C. (George Chatterton) 1867-1951
- Rivière, Henri 1864-1951
- Roloff, Alfred Gustav Christian 1879-1951
- Ross, Edward Alsworth 1866-1951
- Salo, Aukusti 1887-1951
- Scaife, Roger Livingston 1875-1951
- Scheffler, Karl 1869-1951
- Schering, Emil 1873-1951
- Schmid, Heinrich Alfred 1863-1951
- Schmidle, W. (Wilhelm) 1860-1951