- Romero-Romero, Marco A.
- Romero-Villaruel, José de Jesús
- Romeu, A De
- Romeyn B. Hough Co.
- Romfey, L S
- Römig, Mr.
- Romig, M C
- Romig, R F
- Romig, T
- Romig, Thomas
- Romijn, G
- Romina, Daga
- Romines Plant Farm.
- Rominger, Carl Ludwig, 1820-1907
- Rominger, James M
- Rominger, James McDonald, 1928-
- Romiti, Federico
- Römke, Jörg
- Rommel, A
- Rommel, Charles
- Rommel, Erna
- Rommel, George M. (George McCullough), 1876-1945
- Romney, E M
- Romney, Evan M
- Romo de Vivar, Alfonso
- Romo Díez, Ángel María
- Romo, Alberto
- Romo, H
- Romo, Héctor
- Romo, James T
- Romo, Martha I.
- Romo, R M
- Romo-Chacón, Alejandro
- Romoleroux, Katya
- Romón, Pedro
- Romowicz, Agnieszka
- Rompel, Josef
- Romportl, Dušan
- Rompré, Ghislain
- Romspert, Alan P.
- Romy, M
- Romyn, Anton Eric.
- Ron, E
- Ron, Ernesto
- Ron, M. M.
- Ron, Santiago
- Ron, Santiago R.
- Ronald A. Boring (Firm)
- Ronald, J
- Ronald, W. G.
- Ronalds, Alfred.
- Ronalds, Elizabeth.
- Ronalds, Hugh, 1759-1833
- Ronaldson, James
- Ronan, Thomas E
- Ronayne de Ferrer, Patricia A
- Ronayne, John
- Roncada, Maria José
- Roncallo, P
- Roncancio - D, Nestor
- Roncancio, Néstor J
- Roncancio, Néstor J.
- Roncancio-D Néstor
- Ronchetti, G
- Ronchi Teles, Beatriz
- Ronchi, Ausonio
- Ronchi-Teles, B
- Ronchi-Teles, B.
- Ronchi-Teles, B.
- Ronchi-Virgolini, Ana L
- Ronco, Frank.
- Ronco, Lía
- Ronconi, A.
- Ronconi, Robert A.
- Rondanelli, Mauricio
- Rondanelli-Reyes, Mauricio J.
- Rondani, C
- Rondani, Camillo, 1807-1879
- Rondani, Camilo, 1807-1879
- Rondeau, Amelie
- Rondeau, Edith
- Rondeau, G.
- Rondeau, Hawkeye
- Rondeau, J Hawkeye
- Rondelet, Guillaume, 1507-1566
- Rondella, Gisele P.
- Rondelli, Maria Tonelli
- Rondelli, Tonelli
- Ronderos, María Marcela
- Ronderos, Ricardo A
- Ronderos, Richardo A
- Rondina, David
- Rondineli, G
- Rondineli, G.
- Rondineli, Giulianna
- Rondineli, Giulianna Rodrigues
- Rondineli, GR.
- Rondinini, Carlo
- Rondón González, Fernando
- Rondón Médicci, María
- Rondon Neto, Rubens Marques
- Rondon, JN
- Rondon, Josimara N.
- Rondon, Marco
- Rondon, Nelson L.
- Rondón, Rodolfo
- Rondon, Silvia I
- Rondonuwu, S A
- Ronfot, Delphine
- Rong, B
- Rong, Hua
- Rong, Jida
- Rong, Li
- Rong, Tingzhao
- Rong, Xiaoxiao
- Rongholt, J
- Rongstad, Orrin J.
- Ronkay, Gábor
- Ronkay, L
- Ronkay, Laslo
- Ronkay, Laszlo
- Ronkay, László
- Ronkel, Philippus Samuel van, 1870-
- Ronkin, R R
- Rönn, Thomas
- Rönnfeldt, Harriet.
- Rono, Peninah
- Ronqui, Daniele C.
- Ronquist, Fredrik
- Ronse, Anne
- Ronsil, René
- Ronsse & Bollinger.
- Ronzani Cerqueira, Vinicius, 1959-
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- Roo Van Westmaas, E A De
- Roo, A De
- Rooark, Eugene Washburn, 1894-1918
- Rood Pecan Groves.
- Rood, E. Irene, Mrs.
- Rood, Almon N
- Rood, C. M.
- Rood, E. Irene.
- Rood, O N
- Rood, Ogden N. (Ogden Nicholas), 1831-1902
- Rood, Stewart B.
- Roodyn, D.B.,
- Roof, Sharon D.
- Roofe, P G
- Roohi Aminjan, Atabak
- Rooij, Nelly de
- Rooijen, Johan van
- Rook, D A
- Rooke, I J
- Rooke, Thomas
- Rookmaaker, Kees
- Rookmaaker, L C
- Room, Thomas Gerald
- Roon, G Van
- Roon, J M Baerends-Van
- Rooney, Alejandro
- Rooney, Bridget M.,
- Rooney, H M
- Rooney, Ralph J.
- Rooney, Rebecca C.
- Rooney, S C
- Rooney, T P
- Rooney, William R.
- Rooney, WL
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- Roop, Quentin Warren, 1904-
- Rooper, George.
- Roopnarine, P D
- Roopnarine, Peter D.
- Roorbach, Orville Augustus, 1833-1893
- Roos Brothers.
- Roos, Anna-Marie
- Roos, Arthur.
- Roos, Christian
- Roos, Claudine
- Roos, Jelle.
- Roos, Jörg
- Roos, M C
- Roos, Marco
- Roos, Marco C
- Roos, P
- Roos, P H
- Roos, Peter
- Roos, Peter H
- Roos, Richard C
- Roos, Staffan
- Roosa, D M
- Roosenchoon, Peter
- Roosen-Runge, Edward C
- Roosevelt (Ship).
- Roosevelt South American Expeditions (1913-1917)
- Roosevelt, Franklin D. (Franklin Delano), 1882-1945
- Roosevelt, Kermit, 1889-1943
- Roosevelt, Quentin, 1919-1948
- Roosevelt, Robert Barnwell, 1829-1906
- Roosevelt, Theodore, 1858-1919
- Roosevelt-Rondon Scientific Expedition (1913-1914)
- Roos-Kulmann, M. I.
- Roosmalen, John A. M. van
- Roosmalen, Marc G. M. van
- Root & St. George (Firm)
- Root, A. I. (Amos Ives), 1839-1923
- Root, Amos Ives, 1839-1923
- Root, C. M. (Charles Marvin), 1837-
- Root, C. R.
- Root, David W
- Root, E. R. (Ernest Rob), 1862-1953
- Root, Elihu, 1845-1937
- Root, F M
- Root, Francis M
- Root, Francis Metcalf, 1889-
- Root, Frank P
- Root, G. L.
- Root, George A.
- Root, H. H.
- Root, J. M.
- Root, J. W.
- Root, John M.
- Root, John M.,
- Root, Karen V
- Root, Lucie Emma.
- Root, Lyman C., 1840-
- Root, Lyman C., 1840-1928
- Root, Nina J.
- Root, Oscar M
- Root, Peter G
- Root, R B
- Root, R W
- Root, Ralph Rodney.
- Root, Raymond W
- Root, Richard B
- Root, Tammy
- Root, Terry L.
- Root, Timothy F.,
- Root, Walter S
- Root's Nurseries.
- Roozen Brothers.
- Roozen, Ant., & son, Overveen, Holland.
- Ropek, John F.
- Roper, C F E
- Roper, Cfe
- Roper, Clyde F E
- Roper, Clyde F E
- Roper, Clyde F. E., 1937-
- Roper, E W
- Roper, Erika