Crick and Watson's DNA Molecular Model
1953
1953
1942
1955
1936
1956
circa 1917
1935
1946
circa 1923
1950-1960
1939
1925-1935
1928
1919
1925-1935
1958
1945-1955
1920-1937
1942
1959
1935
1952
1947
1930-1960
1955
circa 1932
1935
1937
1937
1938; (1838)
1957
1946-1950
1920-1955
1960s
1960s
1958
1937
1956
1928-1930
1958
1928-1930
1948
1925
1920-1940
circa 1932
1928-1930
1916
1938
1938
circa 1956