Authors: How Louis
- Parker, Louis Napoleon 1852-1944
- Parr, Louisa -1903
- Pascal, Blaise 1623-1662
- Pasteur, Louis 1822-1895
- Patteson, S. Louise (Susanna Louise) 1853-1922
- Pendleton, Louis 1861-1939
- Pergaud, Louis 1882-1915
- Pert, Camille 1865-1952
- Petersen, Louis Christian 1878-
- Philippe, Charles-Louis 1874-1909
- Picard, L.-B. (Louis-Benoît) 1769-1828
- Pierce, Bessie Louise 1888-1974
- Pio, Louis 1841-1894
- Pirkis, Catherine Louisa 1839-1910
- Pirsson, Louis V. (Louis Valentine) 1860-1919
- Pisuisse, Jean-Louis 1880-1927
- Pitou, Louis Ange 1767-1846
- Pöllnitz, Karl Ludwig, Freiherr von 1692-1775
- Pool, Maria Louise 1841-1898
- Postif, Louis 1887-1942
- Post, Louis F. (Louis Freeland) 1849-1928
- Poulbot, Francisque 1879-1946
- Power, Effie 1873-1969
- Pratt-Chadwick, Mara L. (Mara Louise) 1857-1921
- Pratt, Louis W. -
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