Authors: H.
- Pitt-Rivers, Augustus Henry Lane-Fox 1827-1900
- Plate, Ludwig 1862-1937
- Playtner, H. R. -
- Plomer, Henry R. (Henry Robert) 1856-1928
- Plumptre, E. H. (Edward Hayes) 1821-1891
- Pocock, Roger 1865-1941
- Poincaré, Henri 1854-1912
- Pollen, Arthur Joseph Hungerford 1866-1937
- Pollen, John Hungerford 1820-1902
- Pollock, Horatio M. (Horatio Milo) 1868-1950
- Pollock, Walter Herries 1850-1926
- Pond, Gideon H. (Gideon Hollister) 1810-1878
- Poole, Bertram W. H. (Bertram William Henry) 1880-1957
- Poole, Hester M. (Hester Martha) 1833-1932
- Poore, Henry Rankin 1859-1940
- Porter, Edwin H. -
- Porter, Eleanor H. (Eleanor Hodgman) 1868-1920
- Porter, Mary Harriet 1846-1929
- Potter, Harry Spafford 1873-1940
- Potter, Henry Austin 1869-
- Powell, G. H. (George Herbert) 1856-1924
- Preble, George Henry 1816-1885
- Prescott, Thomas H. 1810-1865
- Prescott, William Hickling 1796-1859
- Preston, H. W. (Harriet Waters) 1836-1911
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