When was Mount Rushmore started?
10139
1927
1927
1927
1927
1927
1927
1927
1927
1927
1927
1927
1927
1931
1927
1932
1931
1927
1932
1931
1927
1932
1931
1927
1927.
1932
1931
1927
1927-1984
1927-1938
1927.
1932
1931
1927
1927-1984
1932
1927.
1931
1927-32
1927-1938
1927
1927-1936
1926
1932
1931
1927
1927-1932
1939
1927-1984
1927.
1927-1938
1927-32
1926
1932
1931
1939
1927.
1927-1936
1940s
1927-1981
1927-1984
1926
1927,
1932
1931
1927-1938
1939
1927-32
1927.
1940s
1927 and 1941
1927-1936
1926
1932
1941
1931
1927,
1939
1927-1984
1940s
1927.
1923
1927-1938
1941
1927-32
1927 and 1941
1926
1932
1931
1939
1927-1939
1927,
1940s
1941
1923
1927-1984
1927.
1940
1926
1932
1931
1927-32
1927-1938
1939
1927 and 1941
1941
1927,
1927-1981
1940s
1923
1940
1927.
1926
1932
1941
1931
1939
1927-1984
1927-32
1927 and 1941
1925
1940
1940s
1927,
1923
1927-1938
1941
1927.
1924
1926
1932
1931
1925
1939
1940
1940s
1941
1927-32
1923
1927 and 1941
1927,
1927-1984
1936
1927-27
1925
1940
1924
1926
1932
1927.
1931
1927-1938
1939
1941
1940s
1936
1923
1925
1940
1927-32
1927,
1924
1926
1932
1941
1927-27
1931
1939
1927-1984
1927.
1936
1925
1940
1940s
1927-3
1923
1927-1938
1927 and 1941
1927 to 1941
1941
1927,
1924
1926
1927-28
1936
1932
1931
1925
1939
1940
1921
1927.
1927-1984
1940s
1941
1923
1936
1927-32
1927-1938
1925
1940