When was the Lincoln Memorial opened to the public?
8186
1939
1939
1939
1921
1932
1895
1926
1913
1939
1921
1932
1889
1895
1926
1913
1939
1922
1921
1883
1865
1932
1889
1895
1926
1913
1939
1922
1923
1921
1883
1932
1889
1895
1926
1865
1913
1939
1922
1921
1923
1927
1932
1889
1895
1883
1926
1913
1939
1921
1898
1863
1865
1932
1895
1926
1888
1913
1939
1922
1924
1923
1921
1927
1932
1889
1891
1895
1883
1860
1939
1921
1898
1863
1926
1890
1865
1888
1892
1913
1860
1939
1922
1924
1923
1927
1932
1886
1921
1889
1891
1895
1893
1883
1898
1904
1860
1863
1939
1926
1890
1865
1888
1892
1913
1922
1924
1915
1860
1939
1923
1907
1927
1932
1886
1921
1889
1891
1895
1936
1903
1893
1883
1908
1898
1904
1863
1939
1926
1914
1890
1865
1888
1892
1936
1913
1922
1924
1965
1935
1939
1915
1902
1923
1907
1927
1914
1932
1886
1921
1936
1965
1935
1963
1889
1891
1895
1903
1893
1937
1931
1883
1908
1898
1904
1914
1936
1965
1935
1863
1926
1938
1964
1905
1963
1890
1865
1888
1892
1937
1933
1914
1936
1916
1965
1935
1913
1939
1922
1924
1915
1902
1961
1923
1909
1907
1938
1927
1964
1963
1937