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Institute for Theosophical Society
Institute of Archaeology
Institute of British Architects
Institute of Cancer Research
Institute of Chemistry
Institute of Child Health
Institute of Commonwealth Studies
Institute of Contemporary Arts
Institute of Dermatology
Institute of Directors
Institute of Economic Affairs
Institute of Education, University of London
Institute of Electrical Engineers
Institute of France
Institute of Historical Research, University of London
Institute of Hospital Administration
Institute of Houseworkers
Institute of Hygiene
Institute of Jamaica
Institute of Journalists
Institute of Marine Engineers
Institute of Modern History, Taiwan
Institute of Painters in Watercolour
Institute of Social and Cultural Anthropology
Institute of Social History
Institute of the Blessed Virgin Mary
Institution of Civil Engineers
Institution of Electrical Engineers
Institution of Mechanical Engineers
Institution of Women Shorthand Typists
Institution Royale pour les Jeunes Aveugles
Intelligence Corps
Inter-Departmental Committee on Abortion
Interallied Commission
Intergovernmental Panel on Climate Change
Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services
Internal Revenue
Internal Revenue Service
International African Institute
International and Electric Telegraph Company
International Arbitration and Peace Association
International Arbitration League
International Association for the Total Suppression of Vivisection
International Association of Athletics Federations
International Association of Lyceum Clubs
International Association of Women Police
International Association of Writers for the Defence of Culture
International Astronomical Federation