
Crick and Watson's DNA Molecular Model
1953
1953
1953
1942
1948-1953
1945
1935
1935
1934
1955
1950-1952
1946-1950
1936
1949
1949
1945-1955
1948-1950
1948-1953
1945
1948
1946
1955
1955
1943
1948
1940
1938
1947
1947
1940
1938
1955
1948
1955
1938
1938
1935
1938
1940
circa 1955
1942
1940
1936
1934
1950
1935
1953
1938
1938
1950
1951