- International Congress of Entomology Berlin, Germany) 1938-
- International Congress of Entomology Brisbane, Qld.) 2004-
- International Congress of Entomology Brussels) 1910-
- International Congress of Entomology Brussels, Belgium) 1910-
- International Congress of Entomology Canberra, A.C.T.) 1972-
- International Congress of Entomology Kyoto, Japan) 1980-
- International Congress of Entomology Oxford) 1912-
- International Congress of Entomology Washington, D.C.) 1976-
- International Congress of Genetics London, England) 1906-
- International Congress of Genetics New York) 1902-
- International Congress of Genetics Paris, France) 1911-
- International Congress of Genetics The Hague) 1963-
- International Congress of Genetics.
- International Congress of Histochemistry and Cytochemistry Paris) 1960-
- International Congress of Ophthalmology Utrecht, Netherlands) 1899-
- International Congress Of Soil Science Washington, D.C.) 1927-
- International Congress of Tropical Agriculture London) 1914-
- International congress of tropical agriculture. London, 1914-
- International congress of Tropical and subtropical agriculture. London, England) 1914-
- International Congress of Viticulture San Francisco) 1915-
- International Congress of Zoology (4th : 1898 : Cambridge, England)
- International Congress of Zoology Berlin, Germany) 1901-
- International Congress of Zoology Bern) 1904-
- International Congress of Zoology Cambridge, England) 1898-
- International Congress of Zoology Copenhagen, Denmark). 1953-
- International Congress of Zoology Monaco) 1913-
- International Congress of Zoology Moscow) 1892-
- International Congress of Zoology Paris) 1889-
- International Congress of Zoology. Graz, Austria) 1910-
- International Congress of Zoology. Leiden, Netherlands) 1895-
- International Congress of Zoology. Leyden, Netherlands) 1895-
- International Congress of Zoology. London) 1958-
- International Corbicula Symposium Little Rock, Ark.) 1983-
- International Correspondence Schools.
- International Council for Bird Preservation. Kenya Section.
- International Council for the Exploration of the Sea.
- International dry-farming congress.
- International Entomological Society.
- International Eugenics Congress New York) 1932-
- International Exhibition Cork, Ireland) 1902-
- International Exhibition London, England). 1883-
- International Federation of Cotton and Allied Textile Industries. International Cotton Mission to Brazil.
- International Field Year for the Great Lakes.
- International fisheries commision (U. S. and Great Britain)
- International fisheries commission (United States and Great Britain)
- International Fisheries Conference Detroit, Mich.). 1892-
- International Fisheries Exhibition
- International Fisheries Exhibition Edinburgh, Scotland) 1882-
- International Fisheries Exhibition Trondheim, Norway) 1908-
- International Fisheries Exhibition ( London, England) 1883-
- International Fisheries Exhibition (1898 : Bergen, Norway)
- International Fishery Congress Washington, D.C.) 1908-
- International fishery congress. 4th, Washington, 1908.
- International Forest Congress Paris, France) 1913-
- International Forestry Exhibition Edinburgh, Scotland) 1884-
- International Forestry Exhibition.
- International Garden Club.
- International Geological Commission.
- International Geological Congress Toronto) 1913-
- International Geological Congress Toronto, Ont.) 1913-
- International Geological Congress Vienna, Austria) 1903-
- International Geological Correlation Programme. Project no. 53 "Ecostratigraphy".
- International Harvester Company of America.
- International harvester company of America.
- International harvester company of New Jersey. Agricultural extension dept.
- International Harvester Company of New Jersey. Agriculture extension dept.
- International Harvester Company.
- International High Altitude Expedition To Chile 1935-
- International High Altitude Expedition to Chile (1935)
- International Hoya Association.
- International Indian Ocean Expedition 1960-1965
- International Indian Ocean Expedition ǂd (1960-1965),
- International Institute of Agriculture.
- International Institute of Agriculture. Bureau of Agricultural Intelligence and Plant Diseases
- International Institute of Agriculture. Bureau of Agricultural Intelligence and Plant Diseases.
- International Institute of Agriculture. Bureau of Agricultural Science and Practice
- International Institute of Agriculture. Bureau of Agricultural Science.
- International Institute of Agriculture. Bureau of Economic and Social Intelligence.
- International Institute of Differing Civilizations
- International Institute of Tropical Forestry (Río Piedras, San Juan, P.R.)
- International Legume Conference Saint Louis, Mo.) 1986-
- International Lepidoptera Survey.
- International Library of Technology.
- International Live Stock Exposition.
- International Marine Biological Workshop 6th 1993 Darwin N T-
- International Marine Biological Workshop (6th : 1993 : Darwin, N.T.)
- International Martes Symposium Edmonton, Alta.) 1995-
- International Martes Symposium.
- International Musselwatch Committee.
- International Mycological Conference University of Calgary) 1979-
- International Oceanographic Congress New York) 1959-
- International Organization Of Plant Biosystematists. International Symposium Saint Louis, Mo.) 1992-
- International Ornithological Committee.
- International Ornithological Congress Amsterdam, Netherlands) 1930-
- International Ornithological Congress Basel) 1954-
- International Ornithological Congress Berlin, Germany) 1978-
- International Ornithological Congress Budapest, Hungary 1891-
- International Ornithological Congress Christchurch, N.Z.) 1990-
- International Ornithological Congress Copenhagen, Denmark) 1926-
- International Ornithological Congress Helsinki, Finland) 1958-
- International Ornithological Congress London, England) 1905-
- International Ornithological Congress Moscow, Russia) 1982-
- International Ornithological Congress Oxford) 1966-
- International Ornithological Congress Uppsala) 1950-
- International Ornithological Congress.
- International Ornithological Congress. Standing Committee on Ornithological Nomenclature.
- International Pacific Halibut Commission.
- International Physiological Congress Liège, Belgium) 1892-
- International Phytogeographical Excursion 1913-
- International Phytogeographical Excursion (1st : 1911-
- International Polar Expedition 1882-1883
- International Polar Expedition to Point Barrow, Alaska (1881-1883)
- International Polar Expedition, 1882-1883
- International Rice Research Institute.
- International Rubber and Allied Trades Exhibition (3rd : 1912 : New York, N.Y.). Brazilian Commission.
- International Rubber and Allied Trades Exhibition. New York, N.Y. 1912-
- International Rubber Exhibition.
- International Seed Service.
- International Seed Testing Congress. Copenhagen, 1921-
- International seed testing congress. 3d, Copenhagen, 1921.
- International Seminar on Animal Import Risk Analysis Ottawa, Ont.) 1991-
- International Shrub Symposium Utah State University) 1971-
- International Society for Horticultural Science. Working Group on Fireblight Research.
- International Society for Stereology.
- International Society For The Study And Conservation Of Amphibians
- International Society of Arboriculture.
- International Society of Hymenopterists
- International Soybean Program.
- International Soybean Variety Evaluation Experiments.
- International Stock Food Co. (Minneapolis, Minn.)
- International Stock Food Company.
- International Symposium on Biological Control of Arthropods Christchurch, N.Z.) 2009-
- International Symposium on Biological Control of Weeds Bozeman, Mont.) 1999-
- International Symposium on Growth Lafayette, Ind.) 1960-
- International Symposium on Natural Mammalian Hibernation Dedham, Mass.) 1959-
- International Symposium on Nervous Inhibition Friday Harbor, Wash.) 1960-
- International Symposium on Ostracoda Aberystwyth) 1988-
- International symposium on Ostracoda Greenwich, England) 1997-
- International Symposium on Primary and Initial Effects of Ionizing Radiations on Living Cells Moscow, R.S.F.S.R.) 1960-
- International Symposium on Sustainability Santa Fe, N.M.) 1993-
- International Symposium On The Biology Of The Sipuncula Fort Pierce, Fla.) 2012-
- International Symposium on the Molecular Systematics of Bryophytes Missouri Botanical Garden) 2003-
- International Symposium on the Origin of Life on Earth Moscow). 1957-
- International Symposium on the Origin of Life on the Earth Moscow, R.S.F.S.R.) 1957-
- International Symposium on the Response of the Nervous System to Ionizing Radiation Chicago) 1960-
- International Symposium on Windbreak Technology Lincoln, Neb.) 1986-
- International Trust for Zoological Nomenclature.
- International Union For Conservation Of Nature And Natural Resources.
- International Union of Biochemistry.
- International Union of Biological Sciences.
- International Union of Biological Sciences. General Assembly 1998-
- International Union of Directors of Zoological Gardens
- International Union of Directors of Zoological Gardens.
- International Union of Forest Research Organizations. Working Group on International Cooperation in Forest Disease Research.
- International Union of Forestry Research Organizations.
- International Union of Forestry Research Organizations. Working Group on International Cooperation in Forest Disease Research. Section 24: Forest Protection.
- International Union of Forestry Research Organizations. Working Party on Foliage Diseases.
- International Union of Forestry Research Organizations. Working Party on Needle Diseases.
- International Union of Game Biologists. Congress Kraków, Poland) 1987-
- International Union of Geological Sciences. Project Ecostratigraphy.
- International Workshop on Low-Frequency Propagation and Noise Woods Hole, Mass.) 1974-
- Internationale Kunst- und Grosse Gartenbau-Ausstellung Mannheim, Germany) 1907-
- Internationale Polarforschung (1882-1883)
- Internationaler Entomologischer Verein.
- Internationales Entomologen-Bund.
- Internet Archive (Firm)
- Interocean Düsseldorf, Ger.) 1976-
- Interstate Antelope Conference Alturas, Calif.) 1975-
- Interstate Antelope Conference Alturas, Calif.) 1978-
- Interstate Antelope Conference Lakeview, Or.) 1966-
- Interstate Antelope Conference.
- Interstate Chemical Co.
- Interstate Electronics Corporation. Ocean Engineering Division.
- Inter-State Nurseries (Hamburg, Iowa)
- Interstate Nurseries.
- Inter-State Nurseries.
- Interstate Rose Gardens and Nurseries.
- Inter-state Rose Gardens.
- Interstate Seed & Grain Co. (Fargo, N.D.)
- Interstate Seed and Grain Co.
- Interstate Shorthorn Breeders Association
- Intès, André
- Inthara, Chantip
- Inthararaungsorn, S
- Inthoncharoen, Jitti
- Intorne, Aline Chaves
- Introini, Gisele Orlandi
- Inui, Naoto
- Inui, Ryutei
- Inui, Yasuo
- Inuthai, Janejaree
- Invera, Fabio
- Inverarity, Jonathan Duncan
- Invernizzi, Ciro
- Invertebrate Zoology Expedition (1906-1908)
- Investigaror (Ship)
- Investigator (Marine survey ship)
- Investigator (Ship)
- Invrea, Fabio
- Inward, Daegan J. G.
- Inyang, E G
- Inzaghi, Stefano
- Inzenga, Giuseppe, 1816-1887
- Inzunza-Rojas, Amir
- Ioana, Cobzaru
- Ioannidis, Yiannis
- Ioannidis-Pantopikos, Alexandros
- Iob Boldrini, Ilsi
- Iogna, Patricia A
- Iohow, Federico
- Iomini, Carlo
- ION National Marine Navigation Meeting San Francisco, Calif) 1964-
- Ion Scotta, Michela
- Ion, Mhaela C.
- Iona Flower & Vegetable Plant Nurseries.
- Iona Nurseries and Vegetable Plant Farm.
- Iona Nurseries.
- Ionescu, Danny
- Ionesi, Viorel
- Iongh, Hans H. de
- Ioniță, Marin
- Ionides, C J P
- Ionkova, Iliana
- Ionta, Gretchen M
- Iop, Samanta
- Iorgu, Elena Iulia
- Iorgu, Ionut Stefan
- Iori, Albertina
- Iorio, Carmine
- Iorio, Etienne
- Iorio, Etienne
- Iorio, María I
- Iorns, M. J. (Martin J.)
- Iosias Rihelius.
- Iosif, Ruben
- Iossi, Carmen L.
- Iotti, M
- Iourov, Ivan
- Iova, Bulisa
- Iovane, O
- Iovino, Domenico
- Iowa Academy of Science
- Iowa Conservation Association.
- Iowa Cooperative Fisheries Research Unit,
- Iowa Crop and Livestock Reporting Service.
- Iowa Geological Survey.
- Iowa Nursery & Landscape Co.
- Iowa Ornithological Association.
- Iowa Ornithologists' Union.
- Iowa Seed Co. (Des Moines, Iowa)