- American Colony Stores (Jerusalem, Palestine)
- American Daffodil Society.
- American Dahlia Farms.
- American Dairy Show.
- American Dairymen's Association.
- American Devon Cattle Club.
- American Drug Manufacturers Association.
- American Electric Power Service Corporation.
- American Entomological Institute.
- American Entomological Society.
- American Exotic Nurseries.
- American Express Co.
- American Fat Stock Show.
- American Fern Society.
- American Field Seed Co. (Chicago, Ill.)
- American Field Seed Company.
- American Fish Culturists' Association
- American Fish-Cultural Association
- American Fisheries Society
- American Fisheries Society. Committee on Names of Fishes.
- American Fisheries Society. Montana Chapter.
- American Fisheries Society. Southern Division.
- American Florist Supply Co.
- American Florists Company.
- American Forest Congress Washington, D.C.) 1905-
- American Forestry Association.
- American Forestry Co.
- American Forestry Congress
- American fork & hoe company, Cleveland, O.
- American fur fancier's association.
- American Garden Nursery.
- American Garden Perry'S (Nursery),
- American Genetic Association.
- American Geographical Society
- American Geographical Society of New York.
- American ginseng growers' association.
- American Gloxinia And Gesneriad Society.
- American Gloxinia Society.
- American grain growing company.
- American Guernsey Association.
- American Guernsey Cattle Club.
- American Gutta Percha Company,
- American Hame and Bit Company.
- American Home Economics Association. Meeting Boston, Mass.) 1950-
- American Horse Council.
- American Horse Show.
- American Horticultural Society.
- American Humane Education Society.
- American institute of agriculture, Chicago.
- American Institute of Biological Sciences.
- American Institute of Biological Sciences. Committee on the Handbook of Biological Data.
- American Institute of Electrical Engineers
- American Institute of Park Executives.
- American Institute of the City of New York.
- American Iris Society.
- American Irrigation Federation.
- American Jersey Cattle Club.
- American Joint Committee on Horticultural Nomenclature.
- American Kerry and Dexter Cattle Club.
- American Langshan Club.
- American Lumber Congress Chicago) 1919-
- American Malacological Society
- American Malacological Union.
- American Malacological Union. Pacific Div.
- American Malacologists, Inc.
- American Medical Association.
- American Meteorological Society.
- American Meteorological Society. Committee on the Compendium of Meteorology.
- American Microscopical Society
- American Mission Press (Madras, India),
- American molasso meal co., inc., New Orleans.
- American Mosquito Control Association.
- American Museum Congo Expedition 1909-1915
- American Museum of Natural History
- American Museum of Natural History Field Book Project 2015-
- American Museum of Natural History. Department of Animal Behavior.
- American Museum of Natural History. Department of Education.
- American Museum of Natural History. Department of Fishes and Aquatic Biology.
- American Museum of Natural History. Department of Herpetology.
- American Museum of Natural History. Department of Insects and Spiders.
- American Museum Of Natural History. Department of Invertebrates.
- American Museum of Natural History. Department of Living Invertebrates.
- American Museum of Natural History. Department of Mammalogy.
- American Museum of Natural History. Department of Mammalogy. Archbold Expeditions Collection.
- American Museum of Natural History. Department of Mammalogy. Field Book Collection.
- American Museum of Natural History. Department of Ornithology.
- American Museum of Natural History. Department of Ornithology. Whitney South Sea Expeditions Collection.
- American Museum of Natural History. Department of Public Education.
- American Museum of Natural History. Department of Public Health.
- American Museum of Natural History. Department of Vertebrate Paleontology.
- American Museum of Natural History. Employees' Benefit Association.
- American Museum Of Natural History. Frick Laboratories
- American Museum of Natural History. Jesup Collection.
- American Museum Of Natural History. Southwestern Research Station.
- American Museum of Natural History. Trustees.
- American Museum of Natural History. Frick Laboratories.
- American Museum of Natural History. Southwestern Research Station.
- American Museum Of Natural History-Lamont Geological Observatory Expeditions 1955-1962
- American Museum of Natural History-Lamont Geological Observatory Expeditions (1955-1962)
- American Museum of Natural History-National Museum of Canada Expedition (1961-1962)
- American Museum Yukon Territory-Alaskan Expedition (1936)
- American Museum-Bolivian Expeditions 1963-1965
- American Museum-Bolivian Expeditions (1963-1965)
- American Museum-Hispaniola Expedition 1935-
- American Museum-Terramar Expedition (1994-1995)
- American Museum-Terramar Expedition (1995)
- American Mutual Seed Co.
- American Naturalist
- American Nature Study Society.
- American Nursery Co.
- American Nursery Company.
- American Orchid Society,
- American Ornithologists' Union.
- American Ornithologists' Union. Committee on Classification and Nomenclature.
- American Oxford Down Record Assn.
- American Park and Outdoor Art Association.
- American Pekin Duck Company, Boston.
- American Peony Society.
- American Perennial Gardens,
- American Petroleum Institute.
- American Philosophical Society.
- American Physiological Society (1887- )
- American Phytopathological Society.
- American Phytopathological Society. Fungicide Committee. Subcommittee on Testing and Results of Newer Fungicides.
- American Phytopathological Society. Middle Atlantic States Section.
- American Phytopathological Society. War Emergency Committee.
- American Plant & Seed Co.
- American Plant Life Society.
- American Polled Shorthorn Society
- American Pomological Congress.
- American Pomological Society.
- American Poultry Association.
- American poultry publishing Co.
- American Poultry Publishing Company.
- American Poultry School.
- American Poultry Show.
- American Public Health Association.
- American Public Health Association. Sanitary Engineering Section.
- American Rabbit Breeders Association.
- American Rock Garden Society.
- American Rose and Plant Company (Springfield, Ohio)
- American Rose Society.
- American school of home economics, Chicago.
- American School of Home Economics.
- American Seed & Plant Co.
- American Seed & Plant Company,
- American Seed and Seedtape Company.
- American Seed Co. (Detroit, Mich.)
- American Seed Company (Detroit, Mich.)
- American Seed Company (Fort Worth, Tex.)
- American Seed Company (St. Louis, Mo.)
- American Seed Company.
- American Seed Corp.
- American Seed Garden.
- American seedtape company.
- American Shearer Manufacturing Co.
- American sheep breeder company, Chicago.
- American Shorthorn Breeders' Association.
- American Social Health Association.
- American Social Hygiene Association.
- American Society for Biochemistry and Molecular Biology.
- American Society for Horticultural Science.
- American Society for Microbiology.
- American Society for Quality Control.
- American Society of Agronomy.
- American Society of Biological Chemists.
- American Society of Ichthyologists and Herpetologists
- American Society Of Ichthyologists And Herpetologists. Meeting Lawrence, Kan.) 1965-
- American Society of Ichthyologists and Herpetologists. Nomenclature Committee.
- American Society Of Ichthyologists And Herpetologists. Panel on Systematic Problems in Cnemidophorus.
- American Society of Landscape Architects.
- American Society of Mammalogists.
- American Society of Mechanical Engineers.
- American Society of Mechanical Engineers. Biomechanical and Human Factors Division.
- American Society Of Microscopists.
- American Society of Naturalists.
- American Society of Parasitologists
- American Society of Plant Physiologists.
- American Society of Plant Taxonomists.
- American Society of Zoologists.
- American Society Of Zoologists. Meeting Atlanta, Ga.) 1991-
- American Society of Zoologists. Meeting (1991 : Atlanta, Ga.)
- American Spawn Company (Saint Paul, Minn.)
- American Spawn Company (St. Paul, Minn.)
- American Spawn Company.
- American squab breeders association.
- American Statistical Association.
- American Steel & Wire Co.
- American Sunday-School Union.
- American Supply Company (Quincy, Ill.)
- American Supply Company,
- American Telephone and Telegraph Company.
- American Tract Society.
- American Tree Association.
- American Trust and Savings Bank, Cedar Rapids, Ia.
- American turf congress.
- American University of Beirut.
- American Veterinary Medical Association
- American Water Resources Association.
- American Wood-Preservers' Association.
- American-Canadian fisheries conference.
- American-Honduras Company.
- American-Scandinavian Foundation.
- Amerikaansche Consul ingediend aan hunne Regeering.
- Amerine, M. A. 1911-
- Amerman, Kenneth E.
- Améro, Constant.
- Amersdorffer, Leonhard 1792-1852
- Amerson, A. Binion
- Amery, C F
- Ames Agricultural Implement Co.
- Ames Agricultural Implement Company.
- Ames Botanical Laboratory.
- Ames Plow Company.
- Ames Research Center.
- Ames, Aaron.
- Ames, Alfred H.
- Ames, Blanche
- Ames, C. H.
- Ames, Charles G
- Ames, Charles T.
- Ames, Eileen
- Ames, J. H.
- Ames, John.
- Ames, Kenneth M
- Ames, L. M.
- Ames, Mary E. Pulsifer, 1845-1902
- Ames, Mercedes
- Ames, Oakes, 1874-1950
- Ames, Oliver
- Ames, Peter L
- Ames, R N
- Ames, Ralph W.
- Ames, Robert N
- Ames-Martínez, Fressia Nathalie
- Ametrang, Silvia
- Amevoin, Komina
- Amey, Andrew P.
- Amezcua, Ana
- Amezcua, Felipe
- Amezcua, José Manuel Ramírez
- Améziane-Cominardi, Nadia
- Amézquita, Adolfo
- Amherst College.
- Amherst Nurseries.
- Amherst Patagonian Expedition (8th : 1911)
- Ami, Henry M. (Henry Marc), 1858-1931
- Amiadi, S R
- Amich García, Francisco Manuel
- Amich, Francisco