Authors: O
- Osório, Ana de Castro 1872-1935 5 books
- Opie, Amelia 1769-1853 5 books
- Omond, George W. T. (George William Thomson) 1846-1929 5 books
- Liljencrantz, Ottilie A. (Ottilia Adelina) 1876-1910 5 books
- Schmidt, Otto Ernst 1862-1926 5 books
- Oliphant, Laurence 1829-1888 5 books
- Oppenheim, James 1882-1932 5 books
- Oort, Jan van 1867-1938 5 books
- Wildner, Ödön 1874-1944 4 books
- Oregon Historical Society - 4 books
- Bell, Florence Eveleen Eleanore Olliffe, Lady 1851-1930 4 books
- O'Brien, Frederick 1869-1932 4 books
- Oberfield, William - 4 books
- Orth, Samuel Peter 1873-1922 4 books
- Offor, George 1787-1864 4 books
- Herzl, Theodor 1860-1904 4 books
- Osmaston, Francis Plumptre Beresford 1857-1925 4 books
- Landi, Ortensio - 4 books
- Orzeszkowa, Eliza 1842-1910 4 books
- Hill, Octavia 1838-1912 4 books
- Origen 184-253 4 books
- Stevenson, Fanny Van de Grift 1840-1914 4 books
- Orr, John William 1815-1887 4 books
- Orvieto, Angiolo 1869-1967 4 books
- Opper, Frederick Burr 1857-1937 4 books
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