Topical subject terms, geographical place names, occupations, and forms of material represented in finding aids. Subjects are selected from controlled lists of words and phrases used by the Library of Congress.
I
- Icelandic literature.
- Ichthyology.
- Idaho--Description and travel.
- Idaho--Politics and government.
- Idaho--Social life and customs.
- Ifugao language--Dialects.
- Ifugao (Philippine people)--Music.
- Ifugao (Philippine people)--Rites and ceremonies.
- Ifugao (Philippine people)--Social life and customs.
- Illinois--Commerce.
- Illinois--Description and travel.
- Illinois--History.
- Illinois--History--1778-1865.
- Illinois--History--Civil War, 1861-1865.
- Illinois--History--Civil War, 1861-1865--Prisoners and prisons.
- Illinois--Politics and government.
- Illinois--Politics and government--1865-1950.
- Illinois--Politics and government--1951-.
- Illinois--Politics and government--To 1865.
- Illinois--Social life and customs.
- Illinois Waterway (Ill.).
- Illumination of books and manuscripts--Russia.
- Illustration of books.
- Illustrations--1900-1970.
- Illustrators.
- Imagery (Psychology).
- Immigrants.
- Immigrants--United States.
- Immigrants--Washington (D.C.)--Archives.
- Immunology.
- Impeachments.
- Impeachments--Alaska.
- Impeachments--United States.
- Imperialism.
- Importers.
- Imports.
- Imports--Puerto Rico.
- Impresarios--Correspondence.
- Imprisonment--Psychological aspects.
- Imprisonment--United States.
- Incandescent gas-lighting.
- Incandescent lamps.
- Incas--Music.
- Income maintenance programs.
- Income tax--United States.
- Incunabula.
- Independence (Iowa)--Social life and customs.
- Independent regulatory commissions--United States.
- India--Commerce.
- India--Economic conditions--1945-.
- India--Foreign relations--Pakistan.
- India--Foreign relations--United States.
- Indian agents.
- Indian architecture.
- Indian art.
- Indian Ocean--History, Naval.
- Indian sign language.
- Indian Territory--Politics and government.
- Indian textile fabrics--Southwest, New.
- Indiana--Description and travel.
- Indiana--History.
- Indiana--History--Civil War, 1861-1865.
- Indiana--Politics and government.
- Indiana--Politics and government--19th century.
- Indiana--Social life and customs.
- Indianapolis (Ind.)--Social life and customs.
- Indians--Languages.
- Indians--Legal status, laws, etc.--New Spain.
- Indians of Central America--Languages.
- Indians of Mexico--Languages.
- Indians of Mexico--Mexico--Tehuantepec, Isthmus of.
- Indians of Mexico--Social life and customs.
- Indians of North America.
- Indians of North America--1830-1900.
- Indians of North America--1840-1890.
- Indians of North America--Alabama--Wars.
- Indians of North America--Arizona.
- Indians of North America--California.
- Indians of North America--Claims.
- Indians of North America--Education.
- Indians of North America--Florida.
- Indians of North America--Florida--History.
- Indians of North America--Florida--Wars.
- Indians of North America--Georgia--Wars.
- Indians of North America--Government relations.
- Indians of North America--Government relations--1934-.
- Indians of North America--Great Plains.
- Indians of North America--History.
- Indians of North America--Illinois Territory--History.
- Indians of North America--Land tenure.
- Indians of North America--Languages.
- Indians of North America--Legal status, laws, etc.
- Indians of North America--Louisiana.
- Indians of North America--Michigan.
- Indians of North America--Missions.
- Indians of North America--Missions--Alaska.
- Indians of North America--Nevada.
- Indians of North America--New Mexico--Wars.
- Indians of North America--New York (State).
- Indians of North America--Northwest, Old.
- Indians of North America--Religion.
- Indians of North America--South Carolina.
- Indians of North America--South Dakota.
- Indians of North America--Southwest, New.
- Indians of North America--Texas.
- Indians of North America--Treaties.
- Indians of North America--Wars.
- Indians of North America--Wars--1775-1783.
- Indians of North America--Wars--1815-1875.
- Indians of North America--Wars--1866-1895.
- Indians of North America--Wars--Montana.
- Indians of North America--Wars--West (U.S.).
- Indians of North America--Washington (State).
- Indians of South America--Amazon River Region.
- Indians of South America--Amazon River Region--Diseases.
- Indians of South America--Amazon River Region--Health and hygiene.
- Indians of South America--Amazon River Region--Medicine.
- Indians of South America--Amazon River Region--Nutrition.
- Indians of South America--Languages.
- Indians of South America--Venezuela.
- Indians, Treatment of--New Spain.
- Indigo--Florida.
- Indonesia--Foreign relations.
- Indonesia--Foreign relations--United States.
- Indonesia--History--1945-.
- Indonesia--History--Revolution, 1945-1949.
- Indonesia--Music.
- Indonesia--Politics and government--1950-1966.
- Indonesia--Politics and government--1966-1998.
- Indonesia--Politics and government--20th century.
- Indonesia--Social conditions.
- Indonesia--Social life and customs.
- Industrial design coordination.
- Industrial design--Exhibitions.
- Industrial design--France.
- Industrial design--Great Britain.
- Industrial design--Soviet Union.
- Industrial design--United States.
- Industrial designers.
- Industrial hygiene--Law and legislation.
- Industrial mobilization--United States.
- Industrial policy.
- Industrial policy--United States.
- Industrial relations.
- Industrial relations--United States.
- Industrial revolution.
- Industrial safety.
- Industrial safety--Law and legislation.
- Industrialists.
- Industries--Germany.
- Industries--Middle East.
- Industries--Palestine.
- Industries--Pennsylvania--Philadelphia.
- Industries--Poland.
- Industries--Southern States.
- Industries--United States.
- Inertial navigation systems--Patents.
- Infant psychology.
- Infants.
- Inflammable fabrics.
- Inflation (Finance).
- Inflation (Finance)--United States.
- Influenza Epidemic, 1918-1919--United States.
- Influenza vaccines.
- Information services.
- Information theorists.
- Information theory.
- Infrared spectroscopy.
- Inland water transportation--United States.
- Inner cities.
- Inner cities--United States.
- Inquisition--Mexico.
- Insect pests.
- Insect pests--Control.
- Insects.
- Insects--Washington (D.C.).
- Insignia.
- Instrumental music.
- Insurance.
- Insurance brokers.
- Insurance companies.
- Insurance executives.
- Insurance--Mathematics.
- Insurgency--Mexico.
- Integrated circuit layout.
- Integrated circuits.
- Integrated circuits--Design and construction.
- Intellectual life.
- Intellectual life--Periodicals.
- Intellectual property.
- Intelligence analysts.
- Intelligence officers.
- Intelligence service--China.
- Intelligence service--Government policy--United States.
- Intelligence service--Korea.
- Intelligence service--Soviet Union.
- Intelligence service--United States.
- Interconnected electric utility systems--United States.
- Intercontinental ballistic missiles.
- Interdisciplinary research.
- Internal reflection spectroscopy.
- Internal revenue--California.
- Internal revenue--Northwest, Pacific.
- Internal security.
- Internal security--United States.
- International agencies.
- International agencies--France--Paris.
- International arbitrators.
- International cooperation.
- International courts.
- International economic relations.
- International finance.
- International Geophysical Year, 1957-1958.
- International labor activities.
- International law.
- International organization.
- International peace.
- International relations.
- International relations--History.
- International relief--Belgium.
- International relief--China.
- International trade.
- International Women's Decade, 1976-1985.
- International Years of the Quiet Sun, 1964-1965.
- Internationalism.
- Internationalism--Societies, etc.
- Internationalists.
- Interplanetary voyages.
- Interracial marriage--United States.
- Interstate commerce--Law and legislation--United States.
- Interstate commerce--United States.
- Interviews.
- Interviews--Maine.
- Interviews (Sound recordings).
- Inventions.
- Inventories.
- Inventors.
- Inventors--United States.
- Investments.
- Investments, American--Soviet Union.
- Invoices.
- Iowa--Description and travel.
- Iowa--Economic conditions.
- Iowa--Geography.
- Iowa--Social conditions.
- Iowa--Social life and customs.
- Ipswich (Mass.)--History.
- Iran--Commerce--United States.
- Iran-Contra Affair, 1985-1990.
- Iran--Economic conditions.
- Iran--Foreign relations--United States.
- Iran--History--1905-1911.
- Iran Hostage Crisis, 1979-1981.
- Iran Hostage Crisis, 1979-1981--Personal narratives.
- Iran--Politics and government--1941-1979.
- Iraq--Commerce--United States.
- Iraq--Foreign relations--United States.
- Iraq--History--2003-.
- Iraq War, 2003- .
- Iraq War, 2003-2011.
- Ireland.
- Ireland--Commerce.
- Ireland--Description and travel.
- Ireland--Emigration and immigration.
- Ireland--Foreign relations--United States.
- Ireland--History--16th century.
- Ireland--History--1760-1820.
- Ireland--History--1837-1901.
- Ireland--History--Sinn Fein Rebellion, 1916.
- Ireland--History--War of Independence, 1919-1921.
- Ireland--Politics and government--1760-1820.
- Ireland--Politics and government--20th century.
- Irish Americans.
- Irish Americans--Employment--New Jersey--Paterson.
- Irish Americans--Music.
- Irish Americans--Pennsylvania--Music.
- Irish Americans--Societies, etc.
- Irish question.
- Irish--United States.
- Irish--United States--Music.
- Iron.
- Iron and steel workers--Legal status, laws, etc.--United States.
- Iron industry and trade--Maryland.
- Iron industry and trade--Maryland--Baltimore.
- Iron industry and trade--Pennsylvania.
- Iron industry--Pennsylvania--Pittsburgh.
- Iron manufacturers.
- Iron mines and mining--Pennsylvania.
- Iroquois Indians.
- Iroquois Indians--Music.
- Irrigation--California--Central Valley (Valley).
- Islamic music--Morocco.
- Isolationism.
- Isolationism--United States.
- Israel.
- Israel-Arab Border Conflicts, 1949-.
- Israel-Arab War, 1948-1949.
- Israel-Arab War, 1948-1949--Diplomatic history.
- Israel--Ethnic relations.
- Israel--Foreign relations--United States.
- Israel--History.
- Israel--History--1948-1967.
- Israel--Politics and government.
- Italian American families--West (U.S.).
- Italian Americans--California--Social life and customs.
- Italian Americans--Colorado--Social life and customs.
- Italian Americans--Employment--New Jersey--Paterson.
- Italian Americans--Nevada--Social life and customs.
- Italian Americans--Utah--Social life and customs.
- Italian Americans--Washington--Social life and customs.
- Italian Americans--West (U.S.)--Folklore.
- Italian Americans--West (U.S.)--Religion.
- Italian Americans--West (U.S.)--Social life and customs.
- Italo-Ethiopian War, 1935-1936.
- Italy--Boundaries--Yugoslavia.
- Italy--Description and travel.
- Italy--Foreign relations.
- Italy--Foreign relations--United States.
- Italy--History--1922-1945.
- Italy--History--1945-1976.
- Italy--History--Allied occupation, 1943-1947.
- Italy--Social conditions.
- Iwo Jima, Battle of, Japan, 1945.