- Association of American Anatomists.
- Association of American Geologists and Naturalists.
- Association of American Physicians.
- Association of Applied Biologists.
- Association of Bay Area Governments.
- Association of Breeders of Thorough-Bred Neat Stock.
- Association of Economic Biologists.
- Association of Economic Entomologists. Meeting Springfield, Mass.) 1895-
- Association of experiment station veterinarians.
- Association of Fish and Wildlife Agencies
- Association of Land-Grant Colleges and Universities.
- Association of Land-Grant Colleges.
- Association of Offical Analytical Chemists(U.S.). Commitee on Revision of Methods.
- Association of Official Agricultural Chemists (U.S.)
- Association of official agricultural chemists.
- Association of Official Agricultural Chemists. Committee on Editing Methods of Analysis.
- Association of Official Analytical Chemists. Committee on Editing Methods of Analysis.
- Association of Southeastern Biologists.
- Association of Southern Agricultural Workers.
- Association of State College and University Forestry Research Organizations.
- Association of sugar producers of Puerto Rico. Experiment station, Rio Piedras.
- Association Of Systematics Collections
- Association pour l'étude taxonomique de la flore d'Afrique tropicale. Réunion plenière Missouri Botanical Garden) 1985-
- Association provinciale agricole.
- Association scientifique de France.
- Association technique maritime et aéronautique (France)
- Association zoologique du Léman.
- Associazione agraria friulana.
- Associazione agricola Lombarda di Cote del Palasio.
- Asson-Batres, Mary Ann.
- Assou, Délagnon
- Assumpção, Jorge
- Assumpção, José Maria
- Assumpção, José Vespasiano Lisboa
- Assumpção, Lucileine de
- Assumpção, Maria I.
- Assumpção, Mariana
- Assunção Oliveira, Gabriel
- Assunção, Paulo Apóstolo
- Assunção, Sérgio Lelis
- Assunção, Vivian Almeida
- Assunção, Wilhan R. C.
- Assunção-Albuquerque, MJT.
- Assyov, Boris
- Ast, Friedrich
- Astafieva-Urbaitis, K
- Astafurova, Yulia
- Astapenková, Alena
- Astaras, Christos
- Astarita, Leandro Vieira
- Astarloa, Juan Martín Díaz de
- Astegiano, Julia
- Astell, W
- Aster, Ellis J.,
- Astete, Samuel
- Astete, Sofia
- Astete-Espinoza, Lorena P.
- Asthana, A. K.
- Asthana, Arun
- Asthana, D.
- Asther, Ellis.
- Astié, Andrea A.
- Astill, H. L.
- Astiz, V.
- Astley, Hubert D
- Astley, Hubert Delaval, 1860-
- Astley, Hugh, 1609?
- Astley, John Dugdale, Sir, 3d Bart., 1828-1894
- Astley, Philip, 1742-1814
- Astocondor, Mauro Mariano
- Astolfi Filho, Spartaco
- Aston, A. E.
- Aston, Alasdair
- Aston, George, Sir, 1861-1938
- Aston, Helen I.
- Aston, P.
- Astor, Yrene M.
- Astorga, Daniel Aeta
- Astorga, Francisca
- Astorga, Guadalupe
- Astorga, Marcela P.
- Astorga, María Inés
- Astoria Greenhouses & Nursery.
- Astoria Greenhouses.
- Astracan (Pseudonym)
- Astrakhanʹ (R.S.F.S.R.). Kaspiĭskiĭ nauchno-issledovatel'skiĭ institut morskogo rybnogo khozi͡a͡ĭstva i okeanografii.
- Astrakhanʹ (R.S.F.S.R.). Kaspiĭskiĭ nauchnoissledovatel'skiĭ institut morskogo rybnogo khozi͡a͡ĭstva i okeanografii.
- Astrin, Jonas
- Astrongatt, Stéphane
- Astruc, Jean
- Astúa, Diego.
- Astudillo, Orlando
- Astudillo, René
- Astudillo, Vanesa
- Astuti, Giovanni
- Astuti, Inggit Puji
- Astuya, Allisson
- Asuncion, Daisy A
- Asuncion, Marichelle
- Asuvapongpatana, Somluk
- Aswathanarayana, N V
- Aswathi, P
- Aszalós, Réka
- Asztalos, Marika
- Atab, Daniele R
- Atabey, Eşref
- Atahuachi Burgos, Margoth
- Ataíde, Glauciana da Mata
- Atala, Cristian
- Atallah, Sana Isa
- Atallah, Youssef C
- Ataman, Alper
- Atanasoff, Dimitr.
- Atanasov, Ivan
- Atanasov, Nasko
- Atanasov, Nikolay
- Atanasova, Gabriela
- Atanasova, Maria
- Atanassov, Neno
- Atanga, Fonyam
- Atangana Etémé, R
- Atascadero Seed Co.
- Atascadero Seed Company.
- Atasi, Mary
- Atchison Seed & Flower Store Co.
- Atchison Seed & Flower Store Co.,
- Atchley, William R. 1942-2020
- Ateca, N. S.
- Atehortua, Lucia.
- Atema, Jelle
- Atenafu Abate, Getnet
- Atenas, M.
- Atencio, Adrián
- Ateneo di Brescia.
- Ateyyat, Mazen A
- Atha Gardens,
- Atha, Daniel E.
- Athanas, Michael M
- Athanásio, Camila
- Athanassiou, Christos
- Athanassopoulos, G
- Athar, Mohammad
- Athauda, Senareth B P
- Athavale, Sudeep
- Athayde Filho, Francisco de Paula
- Athayde, ACR.
- Athayde, Eduardo Anversa
- Athearn, Herbert D
- Athens Nursery Company.
- Athersuch, John
- Athersuch, John
- Atherton, Cassandra 1974-
- Atherton, Lyn S
- Atherton, S. C.
- Atherton, Sarah
- Atherton, William
- Athey, Lillian Cox.
- Athey, Raymond
- Athias-Henriot, Claire, 1921-2004
- Athibai, Sujeephon
- Athiê, Samira.
- Athiê-Souza, Sarah Maria
- Athreya, Vidya
- Athreya, Vidya R
- Aththanayaka, A.M.C. Prabhath
- Athwal, D. S.
- Atia, Atta.
- Atiqah, Aida Nur
- Atique, Usman Atique
- Atkeson, Thomas Clark, 1852-1935
- Atkin, Keith, 1938-
- Atkin, Paul
- Atkins Perennial Gardens.
- Atkins, A
- Atkins, A F
- Atkins, Albert J.
- Atkins, Andrew
- Atkins, Andrew F
- Atkins, Charles Grandison, 1841-
- Atkins, Edward G., 1939-
- Atkins, Emerson
- Atkins, Frederick L.
- Atkins, H. J.
- Atkins, Hannah
- Atkins, John
- Atkins, John D.
- Atkins, John W., of Key West, Fla.
- Atkins, John Wyley, 1857-1932
- Atkins, Leonard
- Atkins, Lyn
- Atkins, P. A.
- Atkins, Peter C.
- Atkins, R. P.
- Atkins, Richard Price.
- Atkins, Riley J
- Atkins, Ronald
- Atkins, W. N.
- Atkins, William Ringrose Gelston, 1884-
- Atkinson & Alexander.
- Atkinson Argles, Frank, 1816-1885
- Atkinson, A. T.
- Atkinson, C. J.
- Atkinson, D. A.
- Atkinson, E.
- Atkinson, Edmund, 1831-1901
- Atkinson, Edward L. (Edward Leicester), 1881-1929
- Atkinson, Edward, 1827-1905
- Atkinson, Edwin T. (Edwin Thomas), 1840-1890
- Atkinson, Edwin Thomas
- Atkinson, Eric C.
- Atkinson, Eric.
- Atkinson, F. E.
- Atkinson, Francis Parkman.
- Atkinson, George E., 1870-1913
- Atkinson, George Francis, 1854-1918
- Atkinson, George.
- Atkinson, H. M.
- Atkinson, Herbert, 1936
- Atkinson, Howard
- Atkinson, J. C. (John Christopher), 1814-1900
- Atkinson, J. E.
- Atkinson, James L.
- Atkinson, Jane
- Atkinson, John A
- Atkinson, John, 1787-1828
- Atkinson, K. T.
- Atkinson, Lenette May Rogers, 1899-
- Atkinson, Nancy
- Atkinson, Paul E.
- Atkinson, Penny
- Atkinson, Philip.
- Atkinson, Phillip W
- Atkinson, Reginald N.
- Atkinson, Robert E.
- Atkinson, Robert I.
- Atkinson, Roy.
- Atkinson, Shirley J.
- Atkinson, T. A.
- Atkinson, Thomas H.
- Atkinson, Thomas, 1729?-1798
- Atkinson, V. T. (Vickers T.) -1891
- Atkinson, W. S. 1820-1876
- Atkinson, W. S., active 1905-1906
- Atkinson, Wayne
- Atkinson, Wilmer co., Philadelphia,
- Atkinson, Wilmer, co., Philadelphia,
- Atkinson-Adams, Matthew R.
- Atkore, Vidyadhar
- Atlabahew, Yonas Terefe
- Atlanta Nurseries.