1911 Encyclopædia Britannica/Vol 20:2

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Olbers — Olefine	Oleg — Ollivier	Olmsted — Omalius d'Halloy	Oman — Onomatopoeia
Olbers, Heinrich Wilhelm Matthias Olbia (Euxine) Olbia (Sardinia) Old-age Pensions Oldbury Oldcastle, Sir John Old Catholics Old Deer Oldenbarneveldt, Johan van Oldenburg (grand-duchy) Oldenburg (town) Oldfield, Anne Old Forge Oldham, John Oldham, Thomas Oldham Old Maid Oldmixon, John Old Point Comfort Old Town Oldys, William Olean Oleander Oleaster Olefine	Oleg Oleic Acid Olen Oléron Olfactory System Olga Olgierd Olhão Oligarchy Oligocene System Oligoclase Oliphant, Laurence Oliphant, Margaret Oliphant Oliphant Oliva, Fernan Perez de Olivares, Gaspar de Guzman Olive Oliveira Martins, Joaquin Pedro de Olivenite Oliver, Isaac Oliver, Peter Olives, Mount of Olivetans Olivier, Juste Daniel Olivine Ollivier, Olivier Émile	Olmsted, Denison Olmsted, Frederick Law Olmütz Olney, Richard Olney (England) Olney (U.S.A.) Olonets Olopan Oloron-Sainte-Marie Olshausen, Hermann Oltenitza Olustee Olybrius Olympia Olympia (Washington) Olympiad Olympias Olympiodorus Olympus Olynthus Omagh Omaguas Omaha Omahas Omalius d'Halloy, Jean Baptiste Julien d'	Oman Omar 'Omar Khayyām Ombre Omdurman Omelette Omen Omichund Omnibus Omri Omsk Onagraceae Onatas Onega Oneida (New York) Oneida (tribe) Oneida Community O'Neill O'Neill, Eliza Oneonta Onesicritus Onion Onomacritus Onomatopoeia