Crick and Watson's DNA Molecular Model
1953
1953
1942
1955
1936
1967
1962
1963
1956
1935
1946
circa 1923
1950-1960
1959-1964
1939
1925-1935
1928
1925-1935
1958
1945-1955
1970
1931-1966
1920-1937
1961
1942
1959
1935
1967
1964
1952
1947
1930-1960
1955
circa 1932
1968
1935
1937
1937
1960-1970
1938; (1838)
1957
1946-1950
1920-1955
1957 (original); 1961 (model)
1960s
1960s
1958
1961
1961
1961
1959-1962