Crick and Watson's DNA Molecular Model
1953
1953
1942
1955
1936
circa 1917
1935
1946
1915
circa 1923
1900
1903
1910-1920
1939
1925-1935
1928
1904-1914
1910-1920
1919
1925-1935
1897
1904
1945-1955
1920-1937
1894
1890-1894
1908
1942
1915-1925
1894-1904
1935
1952
1947
1891
1955
circa 1932
1935
1937
1937
1938; (1838)
1946-1950
1920-1955
1937
1910-1920
1928-1930
1928-1930
1948
1925
1920-1940
circa 1932
circa 1890