1911 Encyclopædia Britannica/Vol 20:1

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Ode — Oeben	Oecolampadius — Offenburg	Offertory — Ohligs	Ohm — Olaus Magnus
Ode Odenkirchen Odense Odenwald Oder Oderberg Odescalchi-Erba Odessa Odeum Odilienberg Odin Odo, king of Aquitaine Odo, king of the Franks Odo of Bayeux Odoacer Odofredus O'Donnell O'Donnell, Henry Joseph O'Donovan, Edmund O'Donovan, William Rudolf Odontornithes Odoric Odylic Force Odysseus Oeben, Jean François	Oecolampadius, John Oecology Oecumenical Oecus Oedipus Oehler, Gustav Friedrich Oehringen Oels Oelschläger, Adam Oelsnitz Oelwein Oenomaüs Oenone Oerlams Oesel Oesophagus Oeta Oetinger, Friedrich Christoph Oeynhausen Offa Offa, king of Mercia Offal Offenbach, Jacques Offenbach Offenburg	Offertory Office Officers Official Officinal Ogden Ogdensburg Ogee Ogier the Dane Ogilby, John Ogilvie, John Ogilvy Ogive Oglethorpe, James Edward Ogowé Ogre Ogyges O'Hagan, Thomas O'Hagan, 1st Baron O'Higgins, Bernardo Ohio Ohio Company Ohio River Ohlau Öhlenschläger, Adam Gottlob Ohligs	Ohm, Georg Simon Ohmmeter Ohnet, Georges Ohrdruf Oihenart, Arnauld de Oil City Oil Engine Oillets Oils Oiron Oise (river) Oise (department) Ojibway Okapi Okehampton Oken, Lorenz Okhotsk, Sea of Oki Oklahoma Oklahoma City Okubo Toshimitsu Okuma (Shigenobu), Count Olaf (kings of Norway) Olaf (king of Northumbria and Dublin) Öland Olaus Magnus