
Crick and Watson's DNA Molecular Model
1953
1953
1953
1948-1953
1920-1950
1940
1935-1965
1920-1960
1930-1960
1934
1955
1918-1920
1919
1957
1920-1925
1960
1936
circa 1956-1959
1920-1950
1945-1955
1935
1964
1947-1958
1955
1918
1955
1936
1945
1949
1965
1945-1948
1960
1967
1920-1950
1949
1951
1925-1926
1950
1830 (original); 1967 (model)
1948-1953
1963
1950
1960
1947
1935
1961
1930
circa 1930
circa 1955
1950-1960
1950-1960