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- Allen, Charles A.
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- Allen, Charles H.
- Allen, Charles Loring, 1889-
- Allen, Charles M., 1945-
- Allen, Charles R. K 1908-1998
- Allen, Cleveland.
- Allen, Clifford P. (Clifford Paynter), 1841-
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- Allen, E. R.
- Allen, E. Ross, 1908-1981
- Allen, Edgar W.
- Allen, Edgar, 1892-1943
- Allen, Edgar.
- Allen, Edith B
- Allen, Edward Riley, 1884-
- Allen, Edward Tyson, 1875-
- Allen, Elizabeth
- Allen, Eric R. (Eric Randall)
- Allen, Eugene O.
- Allen, Eugene T.
- Allen, Eugene Thomas, 1864-1964
- Allen, F E
- Allen, F. Sturges (Frederic Sturges), 1861-1920
- Allen, F. W. (Frank Wisdom), 1887-1982
- Allen, Francis H. (Francis Henry), 1866-1953
- Allen, Fred W. Jr.
- Allen, Frederick James, 1864-1927
- Allen, G. F.
- Allen, G. Scott.
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- Allen, George Delwin
- Allen, George E.
- Allen, George Edward.
- Allen, George Howard, 1882-
- Allen, George T. (George Thomas)
- Allen, George.
- Allen, Georgia.
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- Allen, Gerald R.
- Allen, Gerald Robert
- Allen, Geraldine A
- Allen, Gilmour M
- Allen, Glenville F
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- Allen, Grant, 1848-1899
- Allen, H. A.
- Allen, H. W.
- Allen, Hamilton Ford
- Allen, Harriet.
- Allen, Harrison, 1841-1897
- Allen, Harry W. (Harry Willis), 1892-1981
- Allen, Isaac Jackson.
- Allen, Isobel
- Allen, J. A. (Joel Asaph), 1838-1921
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- Allen, J. C.
- Allen, J. Fiske.
- Allen, J. H.
- Allen, J. M.
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- Allen, James Baylis, 1803-1876
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- Allen, James Thomas.
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- Allen, Jessie M. (Jessie May)
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- Allen, John A
- Allen, John A. (John Alpheus), 1810-1888
- Allen, John A. (John Alpheus), 1863-1916
- Allen, John A. (John Anthony), 1926-2020
- Allen, John Alphonse.
- Allen, John Fenwick
- Allen, John Fisk.
- Allen, John M. (John Morgan), 1924-
- Allen, John, 1771-1843
- Allen, John, riding master
- Allen, Jonathan (Publisher)
- Allen, Jonathan, 1773-1845
- Allen, K. C.
- Allen, Karen
- Allen, Katherine A.
- Allen, Kathy
- Allen, Kelly E.
- Allen, Kelsey
- Allen, Kenneth (Biologist)
- Allen, Kenneth (Sanitary engineer)
- Allen, L. H.
- Allen, Larry G
- Allen, Lawrence.
- Allen, Lewis F. (Lewis Falley), 1800-1890
- Allen, Linda
- Allen, Linnaeus.
- Allen, Lorna,
- Allen, Louis A.
- Allen, M. James.
- Allen, M. Jean.
- Allen, M. W.
- Allen, Marion E
- Allen, Mark G
- Allen, Martha L
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- Allen, Morrow J.
- Allen, N. C. B. (Natalie Constance Bowen)
- Allen, Neil W
- Allen, Norman, 1900-
- Allen, O. D. (Oscar Dana), 1836-1913
- Allen, P.
- Allen, Pablo E.
- Allen, Paul E.
- Allen, Paul H. (Paul Hamilton), 1911-1963
- Allen, Peter
- Allen, Phoebe.
- Allen, Priscilla M.
- Allen, R. L. (Richard Lamb), 1803-1869
- Allen, R. L.,
- Allen, Richard Charles.
- Allen, Richard H.
- Allen, Richard K.
- Allen, Robert D
- Allen, Robert Day, 1927-1986
- Allen, Robert L.
- Allen, Robert Lloyd.
- Allen, Robert P
- Allen, Robert Porter, 1905-1963
- Allen, Robert T.
- Allen, Ross
- Allen, Ruth, 1911-
- Allen, Sally.
- Allen, Samuel.
- Allen, Sarah C.
- Allen, Sarah G
- Allen, Selena Dawn
- Allen, Shilah D.
- Allen, Simon
- Allen, Standish K.
- Allen, Sterling & Lothrop.
- Allen, Suzy.
- Allen, T
- Allen, T. C.
- Allen, Terri
- Allen, Thomas George, 1885-
- Allen, Thomas Hunter
- Allen, Thomas J.
- Allen, Thomas, 1813-1882
- Allen, Tim (John Timothy), 1953-
- Allen, Timothy Field, 1837-1902
- Allen, V. R.
- Allen, W. A. (Botanist)
- Allen, W. A. (Entomologist)
- Allen, W. C.
- Allen, W. F.
- Allen, W. J.
- Allen, W. R.
- Allen, Walter Fox.
- Allen, Wendy B
- Allen, William A.
- Allen, William A. (William Alonzo), 1848-1944
- Allen, William B. Jr.
- Allen, William F. (William Fitch), 1875-1951
- Allen, William Henry, 1808-1882
- Allen, William Ray, 1885-1955
- Allen, William W.
- Allen, William, 1793-1864
- Allen, William.
- Allen, Willis Boyd, 1855-1938
- Allen, Winfred Emory, 1873-1947
- Allen, Zachariah, 1795-1882
- Allen., Joel Asaph
- Allenbach Nursery.
- Allenbach, Wm.
- Allenbaugh, Gordon L
- Allen-Brown, A.
- Allen-Brown, D.
- Allende-Canseco Jazive
- Allender, B M
- Allender, Rachael
- Allen-Diaz, Barbara H
- Allen-Rowlandson, T S
- Allen's Nurseries and Seed House.
- Allen's Water Gardens.
- Allenspach, N.
- Alléon-Dulac, Jean Louis, 1723-1788
- Alleoni, Luís Reynaldo Ferracciú
- Aller, Theresa L
- Allert, Thomas
- Allerton, Reuben G.
- Allerton, Samuel Waters, 1828-
- Allescher, Andreas, 1828-1903
- Allestry, James, 1670
- Alletson, T
- Alletson, Tom
- Alletz, Pons Augustin
- Alletz, Pons Augustin, 1703-1785
- Alley, Anthony
- Alley, Henry.
- Alley, Jack R.
- Alley, Neville F
- Alley, Otis Edward, 1899-
- Alley, Wayne P. (Wayne Paul)
- Alleyne, Haynes Gibbes.
- Allez, George
- Allgaier, Howard J
- Allgaier, Martin
- Allgemeine Deutsche Ornithologische Gesellschaft.
- Allgemeine Entomologische Gesellschaft.
- Allgemeine Schweizerische Gesellschaft für die Gesamten Naturwissenschaften.
- Allgén, C. A. (CarlAlgon), 1886-1960
- Allgood, Andrew.
- All-Grow Seed House.
- Alliance Nurseries.
- Alliance Nursery Company.
- Allied Bulb Growers of Puget Sound, Inc.
- Allied Growers Seed Co.
- Allied Seed Company.
- Alliegro, Mark C
- Alliende, M. Angélica
- Allievi, M. I.
- Allin, A. E.
- Alling, Abigail.
- Alling, C. Louis.
- Alling, Harold L. (Harold Lattimore), 1888-1960
- Allioni, Carlo, 1725-1804
- Allis, Edward Phelps, 1851-1947
- Allis, Thomas 1788-1875
- Allison & Addison (Firm)
- Allison, A. C.