- Natal, Delsio
- Natal. Department of Agriculture.
- Natale, E. S.
- Natali, Alessandro
- Natarajan, A V
- Natarajan, J
- Natarajan, K N
- Natarajan, R
- Natarajan, U S
- Natarajan, V
- Natário, Bruno
- Natcher, David C., 1967-
- Natchev, Nikolay
- Natera, Yolimar
- Nath, A
- Nath, S
- Nath, Surendra
- Nath, V R
- Nath, Virendra
- Nathan Smith & Son.
- Nathan Van De Car (Firm)
- Nathan, Erica
- Nathan, Harriet.
- Nathan, J E
- Nathan, P T
- Nathan, S P F
- Nathansohn, Alexander
- Nathi, Y
- Nathorst, A. G. (Alfred Gabriel), 1850-1921
- Nathusius, Hermann von, 1809-1879
- Nathusius, W V
- Nathusius, Wilhelm von, 1821-1899
- Nathusius-Knigsborn, W V
- Nation, J L
- Nation, W.
- Nationaal Natuurhistorisch Museum (Netherlands)
- National 4-H Service Committee.
- National Academy of Sciences (U.S.)
- National Academy of Sciences (U.S.) Committee on Oceanography.
- National Academy of Sciences (U.S.).
- National Academy of Sciences (U.S.). Committee on Effects of Atomic Radiation on Oceanography and Fisheries.
- National Academy of Sciences (U.S.). Committee on Oceanography.
- National Advisory Board for Wild Free-Roaming Horses and Burros China Lake, Calif.) 1975-
- National Advisory Board for Wild Free-Roaming Horses and Burros John Day, Or.) 1976-
- National Advisory Board for Wild Free-Roaming Horses and Burros Rock Springs, Wyo.) 1975-
- National Advisory Board for Wild Free-Roaming Horses and Burros (U.S.). Salt Lake City) 1973-
- National Advisory Board for Wild Free-Roaming Horses and Burros (U.S.). Meeting. Denver, Colorado) 1973-
- National Advisory Board for Wild Free-Roaming Horses and Burros. Billings, Montana) 1973-
- National Advisory Board for Wild Free-Roaming Horses and Burros. Lake Havasu City, Ariz.) 1973-
- National Advisory Board for Wild Free-Roaming Horses and Burros. Reno, Nev.) 1974-
- National Advisory Board for Wild Free-Roaming Horses and Burros. Washington D.C.) 1974-
- National agricultural association. Nashville, Tenn., 1871-
- National Agricultural Congress Philadelphia) 1876-
- National Agricultural Convention, Washington, D.C. 1872-
- National Agricultural Library (U.S.)
- National Agricultural Pesticide Impact Assessment Program (U.S.)
- National Agroforestry Center (U.S.)
- National Animal Disease Center (U.S.)
- National Animal Health Monitoring System (U.S.)
- National Applied Resource Sciences Center (U.S.)
- National Arboretum (U.S.)
- National Association of Audubon Societies for the Protection of Wild Birds and Animals.
- National Association of Gardeners (U.S.)
- National association of state foresters.
- National Association of State Universities and Land-Grant Colleges.
- National Association of Trotting Horse Breeders (U.S.)
- National Audubon Society.
- National Audubon Society. Juneau Chapter.
- National Bee-keepers' Association.
- National Bee-Keepers' Union.
- National Biological Survey (U.S.)
- National Botanic Garden Of Belgium ( Nbgb )
- National Botanic Gardens (Australia)
- National Botanic Gardens (Ireland)
- National Botanic Gardens of South Africa.
- National Botanical Institute (South Africa)
- National British Bird and Mule Club.
- National Broadcasting Company.
- National Bulb Company.
- National Bulb Farms.
- National Business League of America.
- National Cancer Institute (U.S.)
- National Cancer Institute (U.S.). Smoking and Tobacco Control Program.
- National Canine Defence League.
- National Capital Botanical Gardens (Boroko, Papua New Guinea)
- National Capital Orchid Society.
- National Carnation and Picotee Society (Great Britain). Southern Section.
- National Center for Environmental Assessment (Washington, D.C.)
- National Center of Forest Health Management (U.S.)
- National Cheviot sheep society.
- National city company
- National city company.
- National Coastal Ecosystems Team (U.S.)
- National Columbian Wyandotte Club.
- National Committee of the Audubon Societies of America
- National Communicable Disease Center (U.S.)
- National Conference Of Home Economics Extension Workers Washington, D.C.) 1951-
- National conference on education in forestry New Haven, Conn.) 1920-
- National Conference On Family Life Washington, D. C.) 1948-
- National Conference on Fruit and Vegetable Bargaining Cooperatives.
- National Conference on Infantile Mortality. London, 1913-
- National Conference on Outdoor Recreation.
- National Conference on Research Animals in Medicine Washington, D.C.) 1972-
- National Conference On State Parks.
- National congress of fruit growers.
- National Conservation Congress. Washington, D.C., 1913-
- National Convention for the Suppression of Insect Pests and Plant Diseases by Legislation Washington, D.C.) 1897-
- National Convention of Farmers, Gardeners and Silk Culturists New York) 1846-
- National Convention of Fruit Growers.
- National cottonseed products association, inc.
- National Council of Horticulture.
- National Council on Marine Resources and Engineering Development (U.S.)
- National Council on Marine Resources and Engineering Development (U.S.).
- National Dairy Council, Chicago.
- National Data Buoy Center (U.S.)
- National Defense Research Committee (U.S)
- National Ecology Research Center (U.S. Fish and Wildlife Service)
- National Entomological Society (U.S.)
- National Estuarine Inventory (U.S.)
- National farmer and stock grower.
- National Fertilizer Association Plant Food Research Committee. 1925-
- National fertilizer association.
- National Fire Effects Workshop Denver, Colo.) 1978-
- National Fish and Wildlife Foundation (U.S.)
- National Fish and Wildlife Laboratory (U.S.)
- National Fish Habitat Relationships Program (U.S.)
- National Fish Hatchery System (U.S.)
- National Fisheries Institute.
- National Fishery Congress, Tampa, Fla., 1898.
- National Fishery Statistics Program (U.S.)
- National Flower Show Philadelphia, Pa.) 1916-
- National Forage Seed Production Research Center (U.S.)
- National Forest Genetics Laboratory (NFGEL),
- National Forest System (U.S.)
- National Fungus Herbarium.
- National Geographic Society (U.S.)
- National Great Rivers Research and Education Center - NGRREC.
- National Health and Environmental Effects Research Laboratory (U.S.)
- National Health and Environmental Effects Research Laboratory (U.S.). Western Ecology Division.
- National Heart and Lung Institute.
- National Heart Institute (U.S.). Laboratory of Chemistry of Natural Products.
- National Herbarium (South Africa)
- National Herbarium of New South Wales,
- National Herbarium of Victoria.
- National Institute for the Promotion of Science
- National Institute for the Promotion of Science.
- National Institute of Agricultural Botany (Great Britain)
- National Institute of Allergy and Infectious Diseases (U.S.). Office of Recombinant DNA Activities.
- National Institute of General Medical Sciences (U.S.)
- National Institute of General Medical Sciences (U.S.)
- National Institute of General Medical Sciences (U.S.). Office of Recombinant DNA Activities.
- National Institute of Letters, Arts, and Sciences, New York.
- National Institute of Neurological and Communicative Disorders and Stroke. Study of Child Growth and Development and Disease Patterns in Primitive Cultures.
- National Institute of Oceanography of Great Britain.
- National Institute of Science and Technology (Philippines)
- National Institute on Drug Abuse.
- National Institutes of Health (U.S.)
- National Institutes of Health (U.S.). Division of Engineering Services.
- National Institutes of Health (U.S.). Division of Infectious Diseases.
- National Institutes of Health (U.S.). Division of Research Facilities and Resources. Animal Resources Program.
- National Institutes of Health (U.S.). Division of Research Resources. Animal Resources Program.
- National Institutes of Health (U.S.). Office of Recombinant DNA Activities.
- National Institutes of Health (U.S.). Office of the Director.
- National Institution for the Promotion of Science (U.S.)
- National Interagency Fire Center (U.S.)
- National InterAgency Wilderness Conference Tuscon, Arizona). 1993-
- National Iris Gardens (Beaverton, Or.)
- National Irrigation Association (U.S.)
- National Landscape Conservation System (U.S.)
- National Live Stock Producers Association.
- National Microscopical Congress Indianapolis, Ind.) 1878-
- National Mining Association (U.S.)
- National Museum (Australia)
- National Museum (Kenya)
- National Museum (Singapore)
- National Museum of Canada.
- National Museum of Ireland.
- National Museum of Natural History (U.S.)
- National Museum of Natural History (U.S.) Dept. of Invertebrate Zoology
- National Museum of Natural History (U.S.) Pacific Ocean Biological Survey Program
- National Museum of Natural History (U.S.) Palearctic Migratory Bird Survey
- National Museum Of Natural History (U.S.) Palearctic Migratory Bird Survey
- National Museum of Natural History (U.S.). Department of Invertebrate Zoology (Echinoderms)
- National Museum of Natural History (U.S.). Division of Reptiles and Amphibians
- National Museum of Natural Sciences (Canada)
- National Museum of Natural Sciences (Canada). Botany Division.
- National Museum Of Natural Sciences.
- National Museum of Victoria
- National Museum of Victoria.
- National Museums of Canada.
- National Museums of Ceylon.
- National Museums of Kenya
- National Museums of Kenya. Department of Ornithology.
- National Museums of Sri Lanka
- National Norman Horse Association.
- National Nurseries (Lawrence, Kan.)
- National Nurseries,
- National Nursery Co.
- National Nursery Company.
- National Nursery Supply,
- National Nut Growers Association.
- National Nut-growers Association.
- National Ocean Survey.
- National Ocean Survey. Office of Coastal Zone Management.
- National Oceanographic Data Center (U.S.)
- National Oceanographic Data Center (U.S.).
- National Operations Center (U.S.)
- National Operations Center (U.S.). Information and Publishing Services Section.
- National Parks Service
- National Pecan Growers Association. Annual Convention Jacksonville, Florida) 1923-
- National Pecan Growers Association. Annual Convention.
- National pet stock association of America.
- National Petroleum Reserve-Alaska Raptor Disturbance and Mitigation Workshop Fairbanks, Alaska) 1999-
- National Pig Breeders' Association, London.
- National Plant Co.
- National Plant Co., Inc.
- National Plant Company.
- National Plant Materials Center (U.S.)
- National Plant Protection Centre (Bhutan)
- National Planting Service.
- National poultry institute, incorporated, Washington, D.C.
- National Private Non-Industrial Forestry Conference Washington, D.C.) 1979-
- National Recreation Association.
- National Research Council (U.S.)
- National Research Council (U.S.). Botanical Raw Products Committee.
- National Research Council (U.S.). Chemical Biological Coordination Center.
- National Research Council (U.S.). Chemical-Biological Coordination Center.
- National Research Council (U.S.). Committee on Animal Nutrition.
- National Research Council (U.S.). Committee on Celestial Mechanics.
- National Research Council (U.S.). Committee on Neurobiology.
- National Research Council (U.S.). Committee on Nuclear Science.
- National Research Council (U.S.). Committee on Oceanography.
- National Research Council (U.S.). Committee on Pathologic Effects of Atomic Radiation.
- National Research Council (U.S.). Committee on Photobiology.
- National Research Council (U.S.). Committee on Radiation Biology.
- National Research Council (U.S.). Committee on Symposium on Sedimentation.
- National Research Council (U.S.). Committee on the Effects of Radiation on Living Organisms.
- National Research Council (U.S.). Committee on Undersea Warfare.
- National Research Council (U.S.). Committee on Waste Disposal.
- National Research Council (U.S.). Committee on Wild and Free-Roaming Horses and Burros.
- National Research Council (U.S.). Division of Biology and Agriculture.
- National Research Council (U.S.). Division of Medical Sciences.
- National Research Council (U.S.). Division of Physical Sciences.
- National Research Council (U.S.). Highway Research Board. Meeting Washington, D.C.) 1923-
- National Research Council (U.S.). Pacific Science Board.
- National Research Council (U.S.). Patent committee.
- National Research Council (U.S.). Psychology committee.
- National Research Council (U.S.). Research Information Service.
- National Research Council (U.S.). Subcommittee on Radiobiology.
- National Research Council Canada.