Authors: d
- Ogilvie, D. Douglas -
- O'Hara, David 1878-1959
- Ohio Department of Industrial Relations -
- Oikonomides, D. E. (Demosthenes E.) 1858-1938
- Oilliamson, Jeanne de Polignac, comtesse d' 1861-1919
- Olds, Helen Diehl 1895-1981
- O'Leary, De Lacy 1872-1957
- Oliveira, João Duarte -
- Oliveira Martins, J. P. (Joaquim Pedro) 1845-1894
- Oliver, Miquel dels Sants 1864-1920
- Olmsted, Denison 1791-1859
- O'Malley, Charles Donald -
- Onís, Federico de 1885-1966
- Ontario. Department of Education -
- Orbigny, Alcide Dessalines d' 1802-1857
- Orcutt, Philip Dana -
- Orcutt, William Dana 1870-1953
- Ordine della Santissima Annunziata -
- Oriani, Alfredo 1852-1909
- Orléans, Charlotte-Elisabeth, duchesse d' 1652-1722
- Orléans, Henri d', Prince 1867-1901
- Ortigão, Ramalho 1836-1915
- Osborne, David, Mrs. (Fanny) -
- Osborne, Dorothy 1627-1695
- Osborne, Duffield 1858-1917
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