- Iowa Seed Company
- Iowa Seed Company (Des Moines, Iowa)
- Iowa Seed Company.
- Iowa Shorthorn Breeders' Association
- 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, Alex
- Ip, Yin Cheong Aden
- Ip, Yuen Kwong.
- Iparraguirre, Jackson Ricardo Terán
- Ipe, Ipe M
- Ipinza R., J
- Ipinza-Regla, Joaquín
- Ipor, I B
- Ippen, Josef A
- Ippi, Silvina
- Ippolito, Salvatrice
- Ippolitov, Alexei P
- Iqbal, Asim
- Iqbal, J
- Iqbal, Javaid
- Iqbal, Javed
- Iqbal, M
- Iqbal, Muhammad
- Iqbal, Muhammad Sajjad
- Iqbal, Muhammad Zafar
- Iqbal, Nayyer
- Iqbal, S
- Iqbal, S H
- Iqbal, Sonia
- Iqbal, Syed H
- Iqbal, Yasir
- Iqram, Muhammad
- Ira L. Wolf (Firm)
- Iracheta Donjuan, L. (Leobardo)
- Iraeta, A
- Iraeta, Agurtzane
- Iraira Higuera, Sergio
- Iranpour, M
- Iratchet, Paola
- Irawati
- Irazábal, Javier Roberto
- Irby, Augustus Henry
- Irby, Florence M.
- Irby, Howard
- Irby, John Robin McDaniel, 1854-1880
- Irby, L Howard
- Irby, L. Howard (Leonard Howard Lloyd), 1836-1905
- Irby, Lynn R.
- Irby., L Howard
- Irby., Leonard Howard
- Iredale, Harry.
- Iredale, Messrs T
- Iredale, Tom
- Iredale, Tom
- Iredale, Tom
- Iredale, Tom 1880-1972
- 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
- Irigoien, Xabier
- 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 Biogeographical Society.
- Irish Loyal and Patriotic Union.
- Irish, C. W. (Charles Wood), 1834-1904
- Irish, Henry Clay, 1868-
- Irish, J
- Irish, John
- Irisnoll (Firm)
- Irissa Bartlett (Firm)
- Irisson, Jean-Olivier
- Irizarry, Kayla M.,
- Irizuki, Toshiaki
- Irlam, Justin
- 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.
- Irrison, Jean-Olivier
- Iršėnaitė, Reda
- Irsyam, Arifin Surya Dwipa
- Irudayaraj, V
- Iruegas, Rubén
- Irume, Mariana Victória
- Irusta, Jorge B.
- Irvin Ingels (Firm)
- Irvin, Douglas
- Irvin, H. M.
- Irvin, Marc
- Irvine, A. Blair
- Irvine, Alexander, 1793-1873
- Irvine, F. R.
- Irvine, Irina C
- 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
- Irving, C. J.
- Irving, Christopher, 1856
- Irving, Deryck
- Irving, E
- Irving, George W., Jr.
- Irving, Henry, 1850-
- Irving, John Beaufain, 1800-1881
- Irving, Laurence 1895-1979
- Irving, M H
- Irving, Robert S
- Irving, Roland Duer, 1847-1888
- Irving, Stanley D
- Irving, Susan, ornithologist.
- Irving, Susan, ornithologist.
- Irving, Walter.
- Irving, Washington, 1783-1859
- Irvington Nurseries.
- Irvington Nursery.
- Irwanto, Rina Ratnasih
- Irwin, A G
- Irwin, Bonnie J.
- Irwin, Bonnie Jean.
- Irwin, D
- Irwin, Dave
- Irwin, G J
- Irwin, H S
- Irwin, Henry
- Irwin, Howard S.
- Irwin, J Bruce
- Irwin, Jason T
- Irwin, Joshua J
- Irwin, Kelly J
- Irwin, Larry L. (Larry Lynn)
- Irwin, Marian
- Irwin, Mary
- Irwin, Michael E
- Irwin, Michael P. Stuart
- Irwin, Nancy
- Irwin, P Stuart
- Irwin, Roderick R
- Irwin, Roman J.
- Irwin, Sheeba Jabez
- Irwin, Stephen
- Irwin, Steve
- Irwin, Terri
- Irwin, Thomas H
- Irwin, Thomas S
- Irwin, William H.
- Irwin-Harrisons & Crosfield, inc.
- Irwin-Harrisons & Grosfield, inc.
- Irwin-Smith, Vera
- Irwn, Phil
- Isa Miranda, Agueda Veronica
- Isa, Muhammad
- Isaac F. Tillinghast (Firm)
- Isaac Langley Williams (Firm)
- Isaac S. Hendrickson (Firm)
- Isaac, Andréia
- Isaac, Bonnie L.
- Isaac, Colin H. M.
- Isaac, Donald
- Isaac, Frances M
- Isaac, J J
- Isaac, John
- Isaac, Joseph A