Authors: O
- Brownson, Orestes Augustus 1803-1876
- Brummer, Aina 1859-1884
- Buchmann, Otto 1886-
- Buek, Otto 1873-1966
- Bull, Ole 1810-1880
- Bunce, Oliver Bell 1828-1890
- Bunge, Carlos O. (Carlos Octavio) 1875-1918
- Bunnell, Otis Gridley 1868-1929
- Burke, Oliver J. (Oliver Joseph) 1825-1889
- Busbecq, Ogier Ghislain de 1522-1592
- Bussy, Dorothy 1865-1960
- Butler, Frank Osgood 1861-1955
- Byrne, Donn 1889-1928
- Call, Frank Oliver 1878-1956
- Campbell, Alice 1887-1976
- Campbell, Oscar James 1879-1970
- Canada. Post Office Department -
- Canadian War Records Office -
- Carlenius, Olivier August Johan 1841-1904
- Carr, O. A. (Oliver Anderson) 1845-1912
- Cartwright, B. O. (Basil Osborn) 1877-1928
- Causey, James 1924-2003
- Cavara, Otello 1877-1928
- Cesare, Oscar Edward 1885-1948
- Chalmers, George 1742-1825
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