- Physical Oceanography Laboratory.
- Physikalisch-Ökonomische Gesellschaft zu Königsberg
- Physikalisch-Ökonomische Gesellschaft zu Königsberg.
- Physiographiska Sallskapet i Lund
- Physiographiska Sallskapet i Lund.
- Physiographiske forening i Christiania
- Physiographiske forening i Christiania.
- Physiologische Gesellschaft zu Berlin.
- Phythian, J. E. (John Ernest), 1858-
- Phythian, John Ernest, 1858-
- Phythian-Adams, E G
- Phytopathologisch Laboratorium "Willie Commelin Scholten".
- Phytopathologisch Laboratorium "Willie Commelin Scholten."
- pi duo qi
- Pi, Jorge Sabater
- Pi, Yinhui
- Pia y Peuela, Ramn.
- Pia, Julius, 1887-1943
- Pia, Mónica V.
- Piacenti, Erio
- Piacentini, Luis
- Piacentini, Luis N.
- Piacentini, Vítor de Queiroz
- Piacentino, Antonina
- Piaget, E
- Piaget, Edouard
- Piaget, J
- Piaget, Nicole
- Piaggio, M J
- Piálek, Lubomír
- Piana, Gian Pietro
- Piana, P. A.
- Piana, Pitágoras Augusto
- Piana, Renzo,
- Pianetti, GA
- Piani, P
- Pianka, Eric R. (Eric Rodger), 1939-
- Pianka, G
- Pianka, G A
- Piano, Elena
- Pianovskaya, I A
- Piantanida, Martha J
- Piao, Chun-Gen
- Piao, Sheo
- Piapukiew, Jittra
- Piasecke, Jessica R.
- Piaskowski, Victoria D
- Piątek, Krzysztof
- Piatek, Marcin
- Piatigorsky, Joram
- Piatkowski, Uwe
- Piatt, John
- Piatt, John F
- Piattella, E
- Piatti, L.
- Piazza, Ligia Debone
- Piazza, Michele
- Piazza, Paola
- Piazza, S. P.
- Piazzi, L
- Pic, Maurice, 1866-1957
- Pica, Daniela
- Pica, Feliciana
- Picado Twight, Clodomiro
- Picado, C
- Picado, Simone da Silva
- Picaglia, Luigi
- Picanço, Ana
- Picanco, Juliane Bentes
- Picanço, Marcelo Coutinho
- Picapedra, P. H. S.
- Picapedra, Pablo H. dos Santos
- Picapedra, Pablo Henrique dos Santos
- Picapedra, PHS.
- Picard, Emile, 1856-1941
- Picard, François, 1879-1939
- Picard, Isabelle
- Picard, Jacques, 1828-1905
- Picard, J-J
- Picard, Lionel
- Picardi, Daniela
- Picariello, O
- Picariello, Orfeo
- Picart (Philibert) 1825-1895
- Picatoste y Rodríguez, Felipe, 1834-1892
- Picazo, Esteban D.
- Picazo, Félix
- Picca, A
- Picca, Pablo
- Piccard, Auguste, 1884-1962
- Picchi, Douglas G.
- Picchi, Veronica Dougherty
- Picchia, Paulo Celso Dornelles Del
- Picciani, J
- Piccinetti, Corrado
- Piccinin, Jorge Luiz
- Piccinin, R C
- Piccinini, Alexandre
- Piccione, Giuseppe
- Picciulo, Jonathan Charles.
- Piccoli, Antonio Pizzuti
- Piccoli, Carla F.
- Piccoli, Costanza
- Piccoli, Gustavo Cauê de Oliveira
- Piccolo, María C
- Piccolo, Marisa de Cássia
- Piccone, Antonio, 1844-1901
- Piccott, Archibald W., 1869-1926
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- Pichara, Cristian
- Pichard D, Gastón
- Pichard.
- Pichardo y Tapia, Estéban, 1799-1879
- Piché, Céline
- Piché, Edgard W.
- Piché, G.-C. (Gustave-Clodomir), 1880-1956
- Piché, Gustave Clodomir, 1880-
- Picher, C R
- Picheral, B
- Pichet, Pierre
- Pichler, Franz B
- Pichler, Friedrich
- Pichler, HA.
- Pichler, Helen A
- Pichler, Helen Audrey
- Pichlyk, M.
- Pichon, Delphine
- Pichon, M. (Botanist) (Michel)
- Pichon, Marcel
- Pichon, Michel.
- Pichon, P
- Pichon, Samuel
- Pichorim, M
- Pichorim, M.
- Pichorim, Mauro
- Pichuzhkina, O.E.
- Picinelli, Filippo, 1604-ca 1667
- Pick, Adolf Jos
- Pick, Friedrich Karl
- Pick, Joseph 1908-1968
- Pick, Raquel A.
- Pick, T. Pickering 1841-1919
- Pickard, George L. (George Lawson)
- Pickard, J
- Pickard, N A H
- Pickard, Samuel Thomas
- Pickard-Cambridge, Arthur Wallace, Sir, 1873-1952
- Pickard-Cambridge, F. O. (Frederick Octavius), 1860-1905
- Pickard-Cambridge, Octavius, 1828-1917
- Pickavance, J R
- Pickavance, J Roger
- Pickburn, Alex
- Pickel, C
- Picken, Andrew, 1815-1845
- Picken, Thomas, 1870
- Picken, Thomas, 1870
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- Pickens, Bradley A
- Pickens, James B
- Pickens, James B.
- Pickerill, R. K.
- Pickering, Catherine M
- Pickering, Charles, 1805-1878
- Pickering, E. D.
- Pickering, Edward C
- Pickering, Joseph.
- Pickering, Percival Spencer Umfreville, 1858-
- Pickering, Quentin H
- Pickering, R R
- Pickering, Robert B.
- Pickering, Spencer U., 1858-1920
- Pickering, W A
- Pickering, W F
- Pickering, William Henry
- Pickering, William, 1796-1854
- Pickess, Bryan P
- Pickett And Sons
- Pickett, B. S. 1882-
- Pickett, C H
- Pickett, Cleo Pollard.
- Pickett, F L
- Pickett, F. L. (Fermen Layton), 1881-1940
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- Pickett, H. D.
- Pickett, J F
- Pickett, J W
- Pickett, John
- Pickett, John A
- Pickett, John W
- Pickett, Kurt
- Pickett, Kurt M
- Pickett, William D.
- Pickett, William D., 1827-
- Pickford, G. D. (Gerald Duane), 1901-
- Pickford, Grace E 1902-1986
- Pickford, M
- Pickford, Martin
- Pickhardt Renfrew Co.
- Pickhardt, Emile.
- Pickholtz, Renanel
- Picking, Larry
- Pickles, A J
- Pickles, Brian
- Pickles, Robert Stuart Alexander
- Pickles, W
- Pickrell, Alan J.
- Pickstone, H. E. V.
- Pickup, Melinda
- Pickwell, George V.
- Picman, Jaroslav
- Picnic Point Nurseries (Bairnsdale, Vic.)
- Picón Rentería, Patricio
- Picone, P
- Picoral, Mônica
- Picot de Lapeyrouse, Philippe, baron, 1744-1818
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- Picquenard, M C-A
- Picquenard, M Ch
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- Pictet, Arnold
- Pictet, Camille
- Pictet, Charles, 1755-1824
- Pictet, F. G.
- Pictet, François Jules, 1809-1872
- Picton, Bernard
- Picton, Harold D.
- Picton, Irene E.
- Pictorius, Georg, approximately 1500-1569
- Pictou Academy Scientific Association.
- Piddington, Henry, 1797-1858
- Piderit, T.
- Piderit, Theodor, 1826-1898
- Pidgeon, Bob
- Pidgeon, Edward
- Pidgeon, Edward.
- Pidgeon, I M
- Pidgeon, Mark
- Pidgeon, R T
- Pidsley, William E. H.
- Pie, Marcio Roberto
- Pieau, C
- Pieau, Claude
- Piech, Betty Jean.
- Piechnik, Łukasz
- Piechocki, R
- Piechowski, Daniel
- Pieczarka, J
- Pieczarka, Julio
- Pieczarka, Julio C.
- Piedade, Luiz Rubens