- 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
- Inthoncharoen, Jitti
- Intorne, Aline Chaves
- Introini, Gisele Orlandi
- Inui, Ryutei
- Inui, Yasuo
- Inuthai, Janejaree
- 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
- 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
- Iongh, Hans H. de
- Ionides, C. J. P. (Constantine John Philip)
- Ionkova, Iliana
- Ionta, Gretchen M
- Iop, Samanta
- Iorgu, Elena Iulia
- Iorgu, Ionut Stefan
- Iorio, Etienne
- Iorio, María I
- Iorns, M. J. (Martin J.)
- Iosias Rihelius.
- Iosif, Ruben
- Iossi, Carmen L.
- Iova, Bulisa
- Iovane, O
- 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)
- Iowa Seed Company
- Iowa Seed Company (Des Moines, Iowa)
- Iowa Seed Company.
- Iowa State Board of Conservation.
- Iowa State College.
- Iowa State College. Forestry Club.
- Iowa State Horticultural Society.
- Iowa State University of Science and Technology.
- Iowa State University.
- Iowa State University. Dept. of Zoology and Entomology.
- Iowa State University. Herbarium.
- Iowa.
- Iowa. Agricultural Statistics Division.
- Iowa. Dairy commissioner.
- Iowa. Dept. of Agriculture.
- Iowa. Dept. of public instruction.
- Iowa. Food and dairy commission.
- Iowa. Highway Commission.
- Iowa. State board of conservation.
- Iowa. State board of health. Bacteriological laboratory. [from old catalog]
- Iowa. State College of Agriculture and Mechanic Arts. Department of Zoology and Entomology.
- Iowa. State veterinary surgeon.
- Iowa. University. College of medicine. Department of pathology and bacteriology. [from old catalog]
- Ip, Yuen Kwong.
- Iparraguirre, Jackson Ricardo Terán
- Ipe, Ipe M
- Ipinza-Regla, Joaquín
- Ipor, I B
- Ippen, Josef A
- Ippi, Silvina
- Ippolito, Salvatrice
- Ippolitov, Alexei P
- Iqbal, Asim
- Iqbal, Javaid
- Iqbal, Javed
- Iqbal, M
- Iqbal, Muhammad Zafar
- Iqbal, Nayyer
- Iqbal, S
- Iqbal, S H
- Iqbal, Sonia
- Iqbal, Yasir
- Ira L. Wolf (Firm)
- Iracheta Donjuan, L. (Leobardo)
- Iraeta, A
- Iraira Higuera, Sergio
- Iratchet, Paola
- Irawati
- Irby, Augustus Henry
- Irby, John Robin McDaniel, 1854-1880
- Irby, L. Howard (Leonard Howard Lloyd), 1836-1905
- Irby, Lynn R.
- Irby., Leonard Howard
- Iredale, Harry.
- Iredale, Messrs T
- Iredale, Tom
- Iredale, Tom
- Iredale, Tom, 1880-1972
- Iredale., Tom
- Irei, Yuka
- Ireland, Alexander, 1810-1894
- Ireland, David
- Ireland, Ernest W J
- Ireland, Heather
- Ireland, J C
- Ireland, Jennifer
- Ireland, Joseph C., 1893-
- Ireland, Lindsay
- Ireland, Robert R. (Robert Root), 1932-
- Ireland, Trevor R
- Ireland, Z. Jay.
- Ireland. Dept. of Agriculture and Technical Instruction.
- Ireland. Dept. of Fisheries.
- Irestedt, Martin
- IRFAN, MUHAMMAD
- Irfan-Ullah, Mohammed
- Irgang, Bruno E., 1941-2006
- Irgang, G. V.
- Irgang, Georg
- Irham, Mohammad
- Iriart, David
- Iriarte, J. Agustín
- Iriarte, José Luis
- Iriarte, Nelkis
- Iriarte-Díaz Jose
- Iriarte-Díaz José
- Iribarne, Oscar
- Iribárren C., Juan Antonio.
- Irie, Gyokusen.
- Irie, Masaru
- Irie, Takahiro
- Irie, Toshiaki
- Irigoyen, Alejo, 1981-
- Irikov, Atanas
- Iriondo Alegría, José María
- Iriondo, Alexander
- Iris Acre,
- Iris Acres (Molalla, Or.)
- Iris City Gardens (Brentwood, Tenn.)
- Iris City Gardens (Walla Walla, Wash.),
- Iris Fields,
- Iris Fields.
- Iris Garden (Marion, Ohio)
- Iris Garden.
- Iris Gulch,
- Iris Haven,
- Iris Place.
- Iris Test Gardens.
- Irisawa, Aya Funaishi
- Irisawa, Hiroshi
- Irisawa, Satoko
- Iriscrest.
- Irisdale Gardens.
- Irisdale of California.
- Irish Loyal and Patriotic Union.
- Irish, C. W. (Charles Wood), 1834-1904
- Irish, Henry Clay, 1868-
- Irish, John
- Irisnoll (Firm)
- Irissa Bartlett (Firm)
- Irizarry, Kayla M.,
- Irizuki, Toshiaki
- Irland, Frederic.
- Irmer, Andreas
- Irmisch, Thilo, 1816-1879
- Irmler, Ulrich
- Irmscher, Edgar
- Iron Mountain Evergreen Co.,
- Irondequoit Gladiolus Gardens.
- Ironside, Gilbert, 1588-1671
- Iroquois Dahlia Gardens.
- Iroquois Nursery Co.
- Iroumé, Andrés
- Irrazabal, G.
- Iršėnaitė, Reda
- Irudayaraj, V
- Iruegas, Rubén
- Irume, Mariana Victória
- Irvin Ingels (Firm)
- Irvin, H. M.
- Irvin, Marc
- Irvine, A. Blair
- Irvine, Alexander, 1793-1873
- Irvine, James Colquhoun, Sir, 1877-1952
- Irvine, Kenneth M.
- Irvine, L. M. (Linda Mary)
- Irvine, Lyn G
- Irvine, Scott A.
- Irvine, Steven Q
- Irvine, T R
- Irvine, William
- Irving Avenue Nurseries.
- Irving B. Lincoln (Nursery),
- Irving Holcomb (Firm)
- Irving Rouse & Son.
- Irving, A J
- Irving, Annie A.
- Irving, C J