- Procópio, Aldo Rodrigues de Lima
- Procópio, Aline S.
- Procopio, Diego
- Procopio, Diego E.
- Procopio, Diego Esteban
- Procópio, Lilian Costa
- Procópio, Lílian Costa
- Procópio-De-Oliveira P.
- Procter Brothers,
- Procter, D A
- Procter, George H.
- Procter, George H., 1835-
- Procter, Henry, Jr.
- Procter, J B
- Procter, Joan B
- Procter, John Robert, 1844-1903
- Procter, Miss Joan B
- Procter, P J
- Procter, William, 1872-1951
- Procter, William.
- Proctor Brothers,
- Proctor brothers, Gloucester, Mass., pub.
- Proctor, Arthur Bothwell.
- Proctor, E
- Proctor, Eunice M
- Proctor, George Richardson, 1920-2015
- Proctor, Heather Coreen, 1964-
- Proctor, John
- Proctor, John W.
- Proctor, Nathaniel K
- Proctor, Richard A. (Richard Anthony), 1837-1888
- Proctor, Thomas M.
- Proctor, W.
- Prodanov, Bogdan
- Prodanov, CC
- Prodanov, CC.
- Prodanova, Hristina
- Prodgers, Richard.
- Prod'hon, J
- Prod'hon, Jacques
- Prodocimo, Viviane
- Producers' Crop Improvement Association.
- Proebsting, Edward L.
- Proebsting, G
- Proefstation voor de Java-Suikerindustrie.
- Proença Neto, Marco
- Proença, Barbara
- Proença, Carolyn
- Proença, Helen C
- Proença, LAO
- Proença, Luis A.
- Proença, Sonia J. R.
- Proença, Suzana Lúcia
- Proescholdt, Beth
- Profant, D
- Profeit, William.
- Profes, Marcos S
- Proffer & Woolfolk Nursery,
- Proffer, T J
- Proffitt, John L.
- Proffitt, Melissa Anderson
- Profice, S R
- Profice, Sheila R
- Profice, Sheila Regina
- Profile Collecting Co.
- Profile Collecting Company.
- Profili, Giuseppe
- Proft, Christian Gottlob (Kopenhagen)
- Proft, Kirstin
- Proft, Kirstin M
- Progar, R A
- Progene, Maria do Perpétuo Socorro
- Program Definition and Cost Facilitator Group.
- Program in the History of the Biological Sciences and Biotechnology.
- Program in the History of the Biosciences and Biotechnology.
- Programa de Investigación Estratégica en Bolivia.
- Progress Nurseries.
- Progress Nursery Co.
- Progress Nursery Company.
- Prohaska, Karl, 1854-1937
- Prohens, J
- Pröhl, Heike
- Proietti Júnior, Aldo Aparecido
- Proietti, Elisa
- Proietto, Robert L.
- Proios, Konstantinos
- Proix-Noé
- Prokesch von Osten, Anton, Graf, 1795-1876
- Prokhorov, Alexey
- Prokhorov, Vadim
- Prokhorovich, Мaria
- Prokhovnik, Simon James
- Prokin, Alexander
- Prokin, Alexander A.
- Prokofiev, Artém M
- Prokop, Jakub
- Prokop, Michael E
- Prokopenko, A A
- Prokopenko, Mikhail
- Prokopovich, Dale A
- Prokopy, R J
- Prokopy, Ronald J
- Prokrym, D R
- Proksch, P
- Proksch, Peter
- Prola, Carlo
- Proler, Lynette
- Prollius, Friedrich.
- Promaine, Andrew
- ProMax Energy Inc.
- Promis, Alvaro
- Promma, Chatchaba
- Promnun, Pattarapon
- Prompo, R
- Promprao, Jeerisuda
- Promprom, Wilawan
- Promputtha, I
- Promputtha, Itthayakorn
- Prondzinski, Mary
- Pronek, N
- Proni, Edson Aparecido
- Pronina, Galina P
- Pronina, Nina
- Pronk, Cornelis, 1691-1759
- Pronk, G
- Pronos, John, 1944-
- Pronti, Domenico, 1750-
- Pronville, Auguste de.
- Pronzato, R
- Pronzato, R M
- Pronzato, Roberto
- Proo, Sag Del
- Propellers '81 Symposium Virginia Beach, Virginia) 1981-
- Propellers '81 Symposium.
- Property Owners Improvement Co.
- Property Owners' Improvement Co.
- Prophet, C W
- Propp, H
- Prosch, V
- Proschle, Juan
- Proschwitz, Ted von
- Pröse, Herbert K
- Proshchalykin, M. I︠U︡. (Maksim I︠U︡rʹevich)
- Proshek, Benjamin
- Prosi, Rainer
- Proske, U
- Prospect Heights Nursery.
- Prospect Hill Nurseries.
- Prospect Nurseries, Inc.,
- Prospect Plantation Chestnuts,
- Prosperi, C.
- Prósperi, Carlos
- Prosperi, J.
- Prosperi, Juliana
- Prospero, Simone
- Pross Glad Gardens.
- Prosser Nurseries.
- Prosser, C Ladd
- Prosser, C. Ladd (Clifford Ladd), 1907-
- Prosser, Colin D
- Prosser, Filippo
- Prosser, Harry
- Prosser, Sean
- Prosser, Thomas, active 1790-
- Prost, Christian Gottlob (Kopenhagen en Leipzig)
- Prost, Théodose Cyriaque
- Prosvirov, Alexander
- Proszynski, J
- Prószyński, Jerzy
- Protázio, Airan
- Protázio, Arielson
- Protectionist
- Protective Nurseries.
- Prothero, B L
- Prothero, Donald R.
- Protheroe, Ernest.
- Protić, Ljiljana
- Protits, Georg
- Prot-Lassale, J
- Proto Dias, Gardênia
- Proto-Decima, Franca
- Protogino, L C
- Protogino, Lucila
- Protogino, Lucila C
- Protomastro, Jorge J
- Protopappas, Dinos
- Protz, A
- Prötzel, David
- Proud, A
- Proud, D
- Proud, Daniel N
- Proud, Desiree
- Proudfit, S V
- Proudfoot
- Proudfoot, F. G., 1921-
- Proudfoot, G A
- Proudfoot, Glenn A
- Proudfoot, K. G.
- Prouho, M Henri
- Proulx, Benjamin P.
- Proulx, Gilbert, 1954-
- Proulx, Marc
- Proulx, Pauline
- Prous, Marko
- Prous, Xavier
- Prouse, C. Gordon
- Prouse, N. J.
- Proust, Joseph Louis
- Proust, Louis
- Proust, Louis, 1878-1959
- Prout, A E
- Prout, L B
- Prout, L.B
- Prout, Louis B
- Prout., Miss A E
- Prouty, Edith M.
- Prouty, John J.
- Prouty, Lewis I.
- Prouty, Lorenzo, 1839-1882
- Prouty, R M
- Prouty, Richard M
- Provance, Mitchell
- Provance, Mitchell C
- Provancher, L. (Léon), 1820-1892
- Provasoli, L
- Provasoli, Luigi
- Provencher, J. H.
- Provencher, Jennifer F.
- Provensal, M. Cecilia
- Provensal, María C.
- Provenza, Frederick D.
- Provenzale, Antonello
- Provenzano, Anthony J., Jr.
- Provenzano, Francisco
- Provenzano, Rodolfo Silva
- Provera, A
- Proverbs, M D
- Provete, Diogo B.
- Provete, Diogo Borges
- Providence Franklin Society.
- Providence Seed Co.
- Providence Seed Company.
- Provincial Museum of Alberta.
- Provincial Museum of Alberta. Curatorial Section.
- Provincial Museum of Alberta. Natural History Section.
- Provine, John
- Provito, Claudio
- Proviz, Valentina
- Provo Nurseries.
- Provonsha, A V