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- Arita, Yutaka
- Arivazhagan, C
- Ariyama, Hiroyuki
- Ariyarathna, H.A.C.K.
- Ariyasiri, Krishan
- Ariyawansa, Hiran
- Ariyawansa, Hirana
- Ariza Espinar, Luis
- Ariza, Gloria Maria
- Ariza, Gloria María
- Ariza, Mariano
- Ariza, Paola
- Ariza, William
- Ariza-Cortés, William
- Arízaga, Javier de
- Arizaga, Juan
- Arizaga, Santiago
- Arizmendi, María Antonieta
- Arizmendi-Rodríguez, Dana
- Arizona Cactus and Native Flora Society.
- Arizona Cooperative Fish and Wildlife Research Unit.
- Arizona Seed and Floral Company.
- Arizona Seed Company.
- Arizona State Multiple Use Advisory Board.
- Arizona State University. Vascular Plant Herbarium.
- Arizona. Game and Fish Department.
- Arizona. Immigration Commissioner.
- Arizumi, Marci
- Arjomand,Kasra
- Arjomandi, Elham
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- Arkansas Geological Survey.
- Arkansas Native Plant Society.
- Arkansas Nursery Company.
- Arkansas Seed & Nursery Company.
- Arkansas Seed Growers' Association.
- Arkansas Soft Pine Bureau, Little Rock.
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- Arkell, A J
- Arkell, T. R.
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- Arkumarev, Volen
- Arkwright, William, 1857-1925
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- Arlettaz, Raphael
- Arley Costa Pessoa, Felipe
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- Arlie Woodard & Son,
- Arlie, C. H.
- Arlinghaus, Robert
- Arlington Nurseries.
- Arlington Water Lily Gardens.
- Arlington Waterlily Gardens.
- Arloing, S. 1846-1911
- Arloing, Saturnin, 1846-1911
- Arlow, Steve
- Arlt, Debora
- Armacost & Royston.
- Armagan, Metin
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- Armand Pilón, Agustina
- Armand, Alireza
- Armand, Jean-Marc
- Armand, Leanne
- Armani, Ana
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- Armas, Christian
- Armas, ED.
- Armas, J Laura Rodríguez
- Armas, Luis F. de
- Armas, Maricell
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- Armbruster, Ludwig
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- Arme, C.
- Armed Forces Special Weapons Project (U.S.)
- Armelin, Renato Soares
- Armella, Miguel Ángel
- Armenante, Euclide
- Armendano, Andrea
- Armendáriz, Gema
- Armendáriz, Laura Cecilia
- Armendáriz-Toledano, Francisco
- Armengol, M Fernanda López
- Armenta, Jessica
- Armentano, Thomas V
- Armenteras P, Dolors
- Armenteras P., Dolors
- Armenteras, Dolors
- Armenteros, Maickel
- Armentrout, J M
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- Armes, Patricia T.
- Armesto, Juan J
- Armesto, Luis Orlando
- Armetta, Theresa M
- Armiach, Igor
- Armién, Aníbal
- Armién, Aníbal G.
- Armién, Blas
- Armienta Hernández, María Aurora
- Armienta, Ma. Aurora
- Armienta, María Aurora
- Armienta-Hernández, María Aurora
- Armijo De Vega, Carolina
- Armijo, Beeling M
- Armijos-Barros, Jorge
- Armijos-Ojeda, Diego
- Armintrout'S Evergreen Nursery,
- Armiraglio, Stefano
- Armistead, J. J.
- Armit, William E.
- Armitage, Anna R
- Armitage, Brian J.
- Armitage, Derek
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- Armitage, J.
- Armitage, Kenneth B
- Armitage, Michael
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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, Adrian J.
- Armstrong, Adrian John
- Armstrong, Allaina
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- Armstrong, Barry L.
- Armstrong, Bill
- Armstrong, Camila Graziela
- Armstrong, Camilla
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- Armstrong, John C.
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- Armstrong, John W.
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- Armstrong, Kyle N.
- Armstrong, Lee R
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- Armstrong, Patrick H
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- Armstrong, Peter.
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- Armstrong, Sydney Frederick.
- Armstrong, Ted
- Armstrong, Terry
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- Armstrong, W. J. T.
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- Armstrong, William H.
- Armstrong, Wyatt
- Armstrong-Herniman, Wendy
- Armstrong-Ziegler, Judy Gail.
- 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, A
- Arnaud, Elie
- Arnaud, Elizabeth
- Arnaud, Fanny