Crick and Watson's DNA Molecular Model
1953
1953
1948-1953
1919
1935
1920
1926-1932
1934-1935
1990-96
1940
1937
1950
1950
1945
c. 1933
1940-1944
1921
1938-1940
1948
1951
1925
1928
circa 1940
circa 1950
1955; 1830
1941
1925
1946
1932-1936
1943
1931
1950
1951
1926-1928
1930
1926-1934
1927
1935
circa 1945
1951
circa 1953
1928
1928
1918
1919
1948
1923
1938
1945
1948
1920-1950