Geografia umana ed economica

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oblast´OceaniaOceaniaOceaniaOCEANIAOlandaOlbiaOmanOmanOmanOmān, Sultanato diOrenburgOrganization for Democracy and Economic Development (Oded-Guam)Organization for Democracy and Economic Development (Oded-Guam) - Georgia Ucraina Azerbaigian MoldovaOrganization for Economic Cooperation and Development (Oecd)Organization for Economic Cooperation and Development (Oecd) Organizzazione per la cooperazione e lo sviluppo economicoOrganization for Security and Co-operation in Europe (Osce)Organization for Security and Co-operation in Europe (Osce) Organizzazione per la sicurezza e la cooperazione in EuropaOrganization for the Prohibition of Chemical Weapons (Opcw)Organization for the Prohibition of Chemical Weapons (Opcw) Organizzazione per la proibizione delle armi chimicheOrganization of American States (Oas)Organization of American States (Oas) Organizzazione degli stati americaniOrganization of the Islamic Conference (Oic)Organization of the Islamic Conference (Oic) Organizzazione della Conferenza islamicaOrganization of the Petroleum Exporting Countries (Opec)Organization of the Petroleum Exporting Countries (Opec) Organizzazione dei paesi esportatori di petrolioOrissa῾Omān, Sultanato di