
Crick and Watson's DNA Molecular Model
1953
1953
1953
1969-1970
1969
1960
1920-1960
1918
1920-1950
1903
1920-1925
1934
1919
1907
1923
circa 1956-1959
1955
1948-1953
1920-1950
1920-1950
1963
1951
1949
1974
1900-1920
1901-1930
1965
1915-1925
1903
1975
1931
1917
1951
1942
1902
1956
circa 1972
1960-1970
1964
1925-1958
1935-1965
1946
1959
1918-1920
1948-1953
1955
1915-1918
1969
1911
1930-1931
1957