| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Io, in astronomy to Isis, river, England |
| |
| Io, in astronomy |
| Io, in Greek mythology |
| Ioánnina |
| Iocaste |
| iodine |
| iodoform |
| Ion, in Greek mythology |
| ion, in chemistry |
| Iona |
| Ionesco, Eugène |
| Ionia |
| Ionian Islands |
| Ionian school |
| Ionian Sea |
| ionic bond |
| Ionic order |
| ionization |
| ionization chamber |
| ionosphere |
| Iorga, Nicolae |
| Ioshkar-Ola |
| Iowa, indigenous people of North America |
| Iowa, state, United States |
| Iowa, river, United States |
| Iowa, University of |
| Iowa City |
| Iowa State University of Science and Technology |
| ipecac |
| Iphicles |
| Iphigenia |
| Ipin |
| Ipiranga |
| Ipoh |
| Ippolitov-Ivanov, Mikhail Mikhailovich |
| Ipsambul |
| Ipsus |
| Ipswich, city, England |
| Ipswich, town, United States |
| Iqaluit |
| Iqbal, Muhammad |
| Iquique |
| Iquitos |
| Ir |
| IRA, abbreviation |
| Ira, in the Bible |
| Irad |
| Irak |
| Iráklion |
| Irala, Domingo Martínez de |
| Iram |
| Iran |
| Iran-contra affair |
| Iran hostage crisis |
| Iran-Iraq War |
| Iranian languages |
| Irapuato |
| Iraq |
| Iraq War |
| IRAS |
| Irazú |
| Irbil |
| IRBM |
| Iredell, James |
| Ireland, John, American Roman Catholic prelate |
| Ireland, John, English composer |
| Ireland, William Henry |
| Ireland |
| Ireland, Church of |
| Ireland, National University of |
| Ireland, Northern |
| Ireland, Republic of |
| Irenaeus, Saint |
| Irene, Byzantine empress |
| Irene, in Greek religion and mythology |
| Ireton, Henry |
| Iri |
| Irian Jaya |
| Iriarte, Tomás de |
| iridescence |
| iridium |
| Irigoyen, Hipólito |
| Irijah |
| Iris, river, Turkey |
| iris, in anatomy |
| Iris, in Greek mythology |
| iris, in botany |
| Irish elk |
| Irish Free State |
| Irish Land Question |
| Irish language |
| Irish literary renaissance |
| Irish literature |
| Irish moss |
| Irish Republican Army |
| Irish Sea |
| Irish setter |
| Irish terrier |
| Irish water spaniel |
| Irish wolfhound |
| iritis |
| Irkutsk |
| Irnerius |
| Iron, Ralph |
| iron |
| Iron Age |
| ironclad |
| Iron Cross |
| Iron Gate |
| Iron Guard |
| iron lung |
| iron pyrites |
| Ironside, William Edmund Ironside, 1st Baron |
| Ironton |
| ironwood |
| Ironwood Forest National Monument |
| ironwork, ornamental |
| irony |
| Iroquoian |
| Iroquois Confederacy |
| Iroquois League |
| Irrawaddy |
| irredentism |
| irrigation |
| irritable bowel syndrome |
| Ir-shemesh |
| Irtysh |
| Iru |
| Iruma |
| Irún |
| Irvine, William |
| Irvine, city, United States |
| Irvine, town, Scotland |
| Irving, Edward |
| Irving, Sir Henry |
| Irving, John |
| Irving, Washington |
| Irving |
| Irvington |
| Isaac I |
| Isaac II |
| Isaac |
| Isaac, Heinrich |
| Isaacs, Sir Isaac Alfred |
| Isaacs, Jorge |
| Isaacs, Rufus Daniel |
| Isaacs, Susan Sutherland |
| Isabel |
| Isabela, province, Philippines |
| Isabela, ruins, Dominican Republic |
| Isabela, island, Ecuador |
| Isabella I |
| Isabella II |
| Isabella |
| Isabel of Bavaria |
| Isabey, Jean Baptiste |
| Isafjörður |
| Isahaya |
| Isaiah |
| Isaiah, Ascension of |
| Isar |
| Isauria |
| Isca Dumnoniorum |
| Iscah |
| Iscariot |
| Ischia |
| Ischl |
| Ise |
| Isère |
| Iserlohn |
| Isesaki |
| Iseult |
| Iseyin |
| Isfahan |
| Isfjorden |
| Ishbak |
| Ishbi-benob |
| Ish-bosheth |
| Isherwood, Christopher |
| Ishi |
| Ishiah |
| Ishigaki |
| Ishiguro, Kazuo |
| Ishii, Kikujiro |
| Ishikari |
| Ishikawa |
| Ishim, city, Russia |
| Ishim, river, Russia and Kazakhstan |
| Ishimbay |
| Ishinomaki |
| Ishmael |
| Ishmaiah |
| Ishtar |
| Ishuah |
| Ishuai |
| Ishui |
| Isidore of Seville, Saint |
| Isidorus of Miletus |
| Isin |
| isinglass |
| Isis, river, England |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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