When was the Lincoln Memorial opened to the public?
8186
1921
1921
1922
1921
1922
1921
1931
1923
1922
1921
1931
1923
1922
1921
1931
1923
1922
1921
1924
1931
1923
1922
1921
1924
1931
1923
1922
1921
1924
1931
1923
1922
1921
1923.
1924
1921.
1931
1923
1922
1921
1924
1931
April 12, 1914
1922.
1923
1922
1923.
1921
1921.
1924
1931
1923
1922
1921
1924
1915
1922.
1931
1923.
1923
1922
1921.
April 12, 1914
February 12, 1914
1921
1924
1915
1931
1923
1922
1921
1924
1914
1915
1922.
1923.
1931
1921.
April 12, 1914
1923
1922
April 12, 1933
1921
1924
1914
February 12, 1914
1915
1931
1923
1922
1914
February 1922
1921
1924
April 12, 1914
April 12, 1933
1922.
1915
1923.
1914
1931
1921.
May 28, 1914
1923
1922
1921
1920
1924
1914
February 1922
1915
April 12, 1933
February 1921
1931
1920
April 12, 1914
1923
1922
1921
1924
1914
1922.
May 28, 1914
1923.
1915
1920
1921.
April 12, 1933
1931
1923
1922
1914
1919
1921
February 1921
1924
1920
February 1922
April 12, 1914
1915
1914
1931
1919
April 12, 1933
May 28, 1914
1923
1922
1920
1924
1922.
July 4, 1933
1923.
1914
1921.
1919
1915
1931
1920
February 1922
April 12, 1914
1923
1922
November 11, 1971
February 1921
1924
July 4, 1914
1914
1919
February 1924
April 12, 1933
1920
1931
1923
1914
1919
1926
April 12, 1919
1915
November 11, 1971
1922.
1924
July 4, 1933
November 11, 1914
1923.
1920
1921.
February 1915
April 12, 1933
February 1921
May 28, 1914
1933
February 1923
1914
1931
April 12, 1914
1919
1927
February 1924
1923
1920