Authors: L
- Orr, Sutherland, Mrs. 1828-1903
- Orwig, Louise -
- Osborne, Dorothy 1627-1695
- Osborne, Norman J. L. (Norman James Lionel) 1878-1965
- Osbourne, Lloyd 1868-1947
- O'Shaughnessy, Edith 1870-1939
- Oswald, Felix L. (Felix Leopold) 1845-1906
- Ottlik, László 1895-1945
- Ottmann, L. (Louis) -
- Otto, Rudolf 1869-1937
- Ouida 1839-1908
- Oulton, L. -
- Owen, Luella Agnes 1852-1932
- Owen, Robert L. (Robert Latham) 1856-1947
- Paavolainen, Olavi 1903-1964
- Pacific Coast Borax Company -
- Packard, Frank L. (Frank Lucius) 1877-1942
- Packard, Robert L. (Robert Lewis) 1928-
- Pack, Charles Lathrop 1857-1937
- Page, Leigh 1884-1952
- Page, Lucie (Lucie Elizabeth) -
- Paine, W. L. (Walter Lionel) -1915
- Pakiser, L. C. (Louis Charles) 1919-
- Palacios, Alfredo L. (Alfredo Lorenzo) 1878-1965
- Palen, Lewis Stanton 1878-1960
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