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- Armitage, Philip L
- Armitage, William H.
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- Armour and Company.
- Armour, Carl L.
- Armour, G. D. 1864-1949
- Arms Palace Horse Car Company.
- Armsby, Henry Prentiss, 1853-1921
- Armstong, Rob
- Armstrong & Co.
- Armstrong Bros.
- Armstrong College (University of Durham). Agriculture Dept.
- Armstrong Expedition To The Dominican Republic 1932-1933
- Armstrong Expedition to the Dominican Republic (1932-1933)
- Armstrong Nurseries (Ontario, Calif.)
- Armstrong Seed Company.
- Armstrong, Allaina
- Armstrong, Allison Rippin
- Armstrong, Amy E
- Armstrong, Barry L.
- Armstrong, Bill
- Armstrong, Camila Graziela
- Armstrong, David A.
- Armstrong, David M. (David Michael), 1944-
- Armstrong, David W.
- Armstrong, Douglas P.
- Armstrong, E Kate
- Armstrong, E Randolph
- Armstrong, E. Frankland
- Armstrong, E. Wilson
- Armstrong, Edward
- Armstrong, Frank B.
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- Armstrong, G. (Graeme)
- Armstrong, George M
- Armstrong, Henry E.
- Armstrong, Howard A
- Armstrong, J A
- Armstrong, J. A.
- Armstrong, J. B. (Jerome Boneypart), 1832-
- Armstrong, J. W. T.
- Armstrong, James, of Ridsdale, Bellingham
- Armstrong, Jan
- Armstrong, Janet L
- Armstrong, Joanne Karrer
- Armstrong, John
- Armstrong, John (John D.)
- Armstrong, John C.
- Armstrong, John S.
- Armstrong, John W.
- Armstrong, John, 1758-1843
- Armstrong, Kate
- Armstrong, Kyle N.
- Armstrong, Lee R
- Armstrong, Margaret, 1867-1944
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- Armstrong, Patrick H
- Armstrong, Paul G
- Armstrong, Peter B.
- Armstrong, Peter.
- Armstrong, Philip
- Armstrong, Philip Brownell, 1898-
- Armstrong, Rob
- Armstrong, Robert H.
- Armstrong, Robert Pierson.
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- Armstrong, W. D.
- Armstrong, W. J. T.
- Armstrong, Wayne P.
- Armstrong, William H.
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- Armúa de Reyes, C. A.
- Army & Navy Club (London, England),
- Army Medical Museum (U.S.)
- Army Medical Museum (U.S.). Section of Comparative Anatomy.
- Armytage, James Charles, approximately 1820-1897
- Arnal, Adela Olmedilla
- Arnaldus, de Villanova, 1311
- Arnam, Steven
- Arnason, E. M.
- Arnason, J. T.
- Arnaud, Mr.
- Arnaud, A
- Arnaud, Françoise (Biologist)
- Arnaud, Gabriel, 1882-1957
- Arnaud, Gustavo
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- Arndt, Franz Rudolf, 1878-
- Arndt, Hans Joachim
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- Arndt, Thomas
- Arndt, Walther, 1891-1944
- Arndt, Wilhelm, 1750-1813
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- Arnedo, Miquel A
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- Arnelas Seco, Itziar
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- Arnell, S.
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- Arno, Stephen F.
- Arnóczkyné Jakab, Dóra
- Arnold Arboretum.
- Arnold Arboretum. Library.
- Arnold C. Clark Nursery,
- Arnold Puetz (Firm)
- Arnold Seed & Produce Co.
- Arnold, A. F.
- Arnold, A. J., Major.
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- Arnold, B. C.
- Arnold, Benjamin Walworth, 1865-1932
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- Arnold, George, 1881-1962
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- Arnold, Keith A
- Arnold, Ken, 1960-
- Arnold, Lauren Briggs, 1814-1888
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- Arnold, Margaret G.
- Arnold, Michael A
- Arnold, Michael L. (Michael Lynn)
- Arnold, N. A. Rue
- Arnold, Oren.
- Arnold, Peter W
- Arnold, Ralph, 1875-1961
- Arnold, Richard A
- Arnold, Rudolf
- Arnold, Ruth Horner
- Arnold, Sally Chub
- Arnold, Spencer
- Arnold, Suzanne N.
- Arnold, Theodor, 1683-1771
- Arnold, Todd W
- Arnold, V. W.
- Arnold, W. W.
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- Arnoldi, L. V.
- Arnoldus, Saxo.
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- Arnot, Mildred
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- Arnott, Gareth
- Arnott, George A.
- Arnott, George W. Campbell, 1856-
- Arnott, Howard J
- Arnott, John
- Arnott, Samuel
- Arnott-Bryce, Madeline
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- Arnould, L.
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- Arnoult, Jacques 1914-1995
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- Arntz, Wolf E
- Arnz, A.
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- Aroca, Gésica
- Aromatari, Giuseppe degli, 1587-1660
- Aron, Alejandro
- Aronesty, Michael
- Aronoff, Sam.
- Aronowitz, Olga
- Aronowsky, Audrey
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- Aronson, James
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- Aronson, Richard B.
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- Arora, G. L.
- Arora, K. L.
- Arora, Ramesh
- Arosa, María L
- Arouca, R. G.
- Aroza Montes, María del Pilar
- Arp Nursery Company.
- Arp Roses Inc.,
- Arp, Alissa J
- Arp, Gerald K