Authors: O
- Neal, John 1793-1876 2 books
- Friel, Arthur O. (Arthur Olney) 1885-1959 2 books
- Raymond, W. O. (William Odber) 1853-1923 2 books
- Rooke, Octavius - 2 books
- Pick, Otto 1887-1940 2 books
- Olcott, Charles S. (Charles Sumner) 1864-1935 2 books
- Call, Frank Oliver 1878-1956 2 books
- Potamian, Brother 1837-1917 2 books
- Okakura, Kakuzo 1862-1913 2 books
- Owen, J. A. (Jean Allan) 1841-1922 2 books
- MacLean, John 1851-1928 2 books
- Tiuppa, Otto 1872-1914 2 books
- Fouché, Joseph, duc d'Otrante 1759-1820 2 books
- Oksanen, Vilho - 2 books
- Tuomi, Otto 1869-1930 2 books
- Binns, Ottwell 1872-1935 2 books
- Lewis, Harriet 1841-1878 2 books
- Henne am Rhyn, Otto 1828-1914 2 books
- Harper, Olive 1842-1915 2 books
- Owen, John 1766-1822 2 books
- O'Grady, Standish 1846-1928 2 books
- Odum, Howard Washington 1884-1954 2 books
- International Institute of Bibliography - 2 books
- White Sands Missile Range (N.M.). Public Affairs Office - 2 books
- Orton, Helen Fuller 1872-1955 2 books
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