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- Arlettaz, Raphael
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- Arlie, C. H.
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- Arlington Water Lily Gardens.
- Arlington Waterlily Gardens.
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- Arloing, Saturnin, 1846-1911
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- Armed Forces Special Weapons Project (U.S.)
- Armelin, Renato Soares
- Armella, Miguel Ángel
- Armenante, Euclide
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- Armendáriz, Gema
- Armendáriz, Laura Cecilia
- Armendáriz-Toledano, Francisco
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- Armenteras P., Dolors
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- Armienta, Ma. Aurora
- Armienta, María Aurora
- Armienta-Hernández, María Aurora
- Armijo De Vega, Carolina
- Armijo, Beeling M
- Armijos-Ojeda, Diego
- Armintrout'S Evergreen Nursery,
- Armistead, J. J.
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- Armitage, Derek
- Armitage, H. M. (Horace Morton), 1890-
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- Armsby, Henry Prentiss, 1853-1921
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- 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
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- Armstrong, John C.
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- 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
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- Arnaldus, de Villanova, 1311
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- Arnason, J. T.
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- Arnaud, A
- Arnaud, Françoise (Biologist)
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- Arndt, Thomas
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- Arnelas Seco, Itziar
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- Arnold Arboretum. Library.
- Arnold C. Clark Nursery,
- Arnold Puetz (Firm)
- Arnold Seed & Produce Co.
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