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Primary media Name Nationality Date
Media FileLouis OrrAmericanAmerican, 1879–1966
Media FileLucy OrtaBritishBritish, born 1966
Media FileManuel OraziItalianItalian, 1860–1934
Media FileMary OberingAmericanAmerican, born 1937
Media FileMasuho OhnoJapaneseJapanese, born 1936
Media FileMaud OakesAmericanAmerican, 1903–1990
Media FileMichael Augustin Power O'MalleyAmericanAmerican, 1878–1946
Media FileNance O'Banion
Media FileNathan OliveiraAmericanAmerican, 1928–2010
Media FileOgata GekkoJapaneseJapanese, 1859 – 1920