Authors: La
- Navarro y Lamarca, Carlos -
- Négyesy, László 1861-1933
- Nerval, Gérard de 1808-1855
- Nevill, Dorothy, Lady 1826-1913
- New York (State). Lake Champlain Tercentenary Commission -
- Nichols, J. L. (James Lawrence) -1895
- Nicolas, Sarah Davison, Lady -
- Nisbet, Noel L. (Noel Laura) 1887-1956
- Noel, Augusta, Lady 1838-1902
- Nolan, Laurence J. -
- Oakland Land, Loan and Trust Company -
- O'Connor, John Lawrence 1875-
- O'Donoghue, Power, Mrs. 1858-
- Offenbecker, Larry 1913-2011
- O'Leary, De Lacy 1872-1957
- O'Leary, Peter 1839-1920
- Oliphant, Laurence 1829-1888
- Olmsted, Frederick Law 1870-1957
- Olmsted, Frederick Law 1822-1903
- O'Neill, Rose Cecil 1874-1944
- Oppenheim, L. (Lassa) 1858-1919
- Orléans, Charlotte-Elisabeth, duchesse d' 1652-1722
- Osborne, Dorothy 1627-1695
- Ottlik, László 1895-1945
- Ouida 1839-1908
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