Authors: H.
- Perkins, Frank H. 1854-
- Perkins, George H. (George Henry) 1844-1933
- Perkins, Henry 1803-1889
- Perris, G. H. (George Herbert) 1866-1920
- Peschges, John H. -
- Peterson, Harold L. (Harold Leslie) 1922-1978
- Petherick, Horace 1839-1919
- Petitmangin, H. (Henri) 1872-1937
- Pettis, George H. 1834-
- Pettit, H. M. -
- Phelps, A. H. -
- Phillips, Henry Wallace 1869-1930
- Phillpotts, Henry 1778-1869
- Philpot, J. H., Mrs. -
- Picciotto, M. H. -
- Pierce, Henry M. (Henry Miller) 1831-1902
- Pierce, Henry Niles 1820-1899
- Pierce, H. Winthrop (Herman Winthrop) 1850-
- Pierson, Hamilton W. (Hamilton Wilcox) 1817-1888
- Pike, H. Lee M. (Henry Lee Mitchell) 1865-
- Pilsbry, Henry Augustus 1862-1957
- Piper, H. Beam 1904-1964
- Pirenne, Henri 1862-1935
- Pispa, Hanna -
- Pitcher, N. Sotheby (Neville Sotheby) 1889-1959
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