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- Akademie der Wissenschaften in Göttingen
- Akademie der Wissenschaften in Wien.
- Akademie der Wissenschaften in Wien. Mathematisch-Naturwissenschaftliche Klasse.
- Akademie ved Ceské republiky
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- Akademii︠a︡ Nauk Sssr. Komissii︠a︡ po izuchenii︠u︡ chetvertichnogo perioda.
- Akademii͡a nauk SSSR. Otdelenie fiziko-matematicheskikh nauk.
- Akademii͡a nauk SSSR. Otdelenie geologo-geograficheskikh nauk.
- Akademisch Museum te Groningen.
- Akademische Jubiläumsstifung (Berlin, Germany)
- Akademischer Naturwissenschaftliche Verein.
- Akademiska Boktryckeriet.
- Akademja Umiejętności w Krakowie.
- Akademja Umiejętności w Krakowie. Wydział Matematyczno-Przyrodniczy
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- Aké-Castillo, José Antolín
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- Akehurst Nurseries,
- Akel, Matt
- Akeley Expedition to British East Africa (1909-1911)
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- Aksu, Ismail
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- Al Balawi, Manal S.
- Al Dhafer, Hathal
- Al Gazi, Ariel David Freitas
- Al Hemaidi, Ahmad Amer
- Al Jaidah, Noora
- Al Khatib, Fadel
- Al Kolibi, Fahad M.
- Al Mutairi, Mohammed
- Al Noor, Sajed
- Ala, Schweizerische Gesellschaft für Vogelkunde und Vogelschutz.
- Alabama Academy of Science.
- Alabama Agricultural Experiment Station.
- Alabama Gulf Coast Nurseries.
- Alabama Museum of Natural History.
- Alabama Nursery Co.
- Alabama Nursery Company (East Saint Louis, Ill.)
- Alabama Nursery Company.
- Alabama Pecan Growers' Association. Annual Convention.
- Alabama.
- Alabama. Dept. of Agriculture and Industries.
- Alabama. Dept. of Agriculture.
- Alabama. Dept. of education.
- Alabama. Dept. of Game and Fish.
- Alabama. Live Stock Sanitary Board.
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- Alagona Arthelouche, d'seigneur de Mararvecques.
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- Alam, Md Mahabub
- Alam, Md. Khorshed
- Alam, Md. Shamshad
- Alam, Mohammad Shafiqui
- Alam, Mohd.
- Alam, Muhammad Maqsood
- Alam, Noore
- Alam, S.
- Alameda Creek Nursery.
- Alaminos, Javier
- Alamiri, Zaid
- Alamo, Eduardo Carqué
- Alamsyah, Firman
- Alamy Filho, José Eduardo.
- Alan McMurtrie
- Alanís Flores, Glafiro J.
- Alanís-Rodríguez, Eduardo
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- Alanwold Nursery.
- Alarcón C, Paula
- Alarcón Cabañero, Juan José
- Alarcón, Alejandro
- Alarcón, Carolina
- Alarcón, Consuelo
- Alarcón, Diego
- Alarcón, Emilio
- Alarcón, Gadiel
- Alarcón, Iván
- Alarcón, Manuel
- Alarcón, Mauricio E.
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- Alaska Agricultural Experiment Station.
- Alaska Forest Research Center (U.S.)
- Alaska Interagency Coordination Center.
- Alaska Quaternary Center.