Authors: O
- Hovey, Edmund Otis 1862-1924 1 book
- Haussonville, comte d' 1843-1924 1 book
- Osborn, H. S. (Henry Stafford) 1823-1894 1 book
- Osterloh, Agnes - 1 book
- Olson, Oscar Ludvig 1872- 1 book
- Nelson, N. O. (Nelson Oliver) 1844-1922 1 book
- Joseph, Oscar L. (Oscar Loos) 1873- 1 book
- Schmeil, O. (Otto) 1860-1943 1 book
- Witte, Otto A. - 1 book
- Paulding, James Kirke 1778-1860 1 book
- Wegner, Armin T. 1886-1978 1 book
- Henry, O. (Spirit) 1862-1910 1 book
- Lawrence Radiation Laboratory - 1 book
- Orr, Anne 1875-1946 1 book
- Diraison-Seylor, Olivier 1873-1916 1 book
- Orton, George W. 1873-1958 1 book
- Tubby, Gertrude Ogden 1878-1967 1 book
- Davis, Calvin Olin 1871-1954 1 book
- O'Leary, James - 1 book
- United States. Office of Strategic Services - 1 book
- Davis, Thomas 1814-1845 1 book
- Overstreet, H. A. (Harry Allen) 1875-1970 1 book
- Oppman, Artur 1867-1932 1 book
- Odhner, Einar 1884-1973 1 book
- Otto, Rudolf 1869-1937 1 book
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