1911 Encyclopædia Britannica/Vol 20:3

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Onondaga — Opinion	Opitz von Boberfeld — Orange	Orangeburg — Order	Order — Orendel
Onondaga Onosander Onslow, Earl of Onslow, Arthur Ontario Ontario, Lake Onteniente Ontology Onyx Oolite Oosterzee, Jan Jacob van Ootacamund Ooze Opah Opal Opalina Opata Opera Ophicleide Ophir Ophites Ophthalmology Opie, Amelia Opie, John Opinion	Opitz von Boberfeld, Martin Opium Opladen Opon Oporto Opossum Oppel, Carl Albert Oppeln Oppenheim Oppert, Julius Oppian Oppius, Gaius Optics Option Opus Orach Oracle Orakzai Oran Orange, House of Orange (New South Wales) Orange (France) Orange (New Jersey) Orange (river) Orange	Orangeburg Orange Free State Orangemen Orang-Utan Oranienbaum Oraons Oratorio Oratory Oratory of St Philip Neri, Congregation of the Orb Orbetello Orbigny, Alcide Dessalines d' Orbilius, Pupillus Orbit Orcagna Orchard Orchardson, Sir William Quiller Orchestra Orchestrion Orchha Orchids Orchomenus Orcin Ordeal Order	Order (architecture) Order, Holy Order in Council Orderic Vitalis Ordinance (architecture) Ordinance (legislation) Ordinary Ordinate Ordnance Ordovician System Ordu Orduin-Nashchokin, Athanasy Lavrentevich Örebro Ore-dressing Oregon Oregon City O'Reilly, John Boyle Orel (government) Orel (town) O'Rell, Max Orelli, Hans Konrad von Orelli, Johann Caspar von Orenburg (government) Orenburg (town) Orendel