Crick and Watson's DNA Molecular Model
1953
1953
1948-1953
1935
1934-1935
1990-96
1940
1937
1950
1950
1945
c. 1933
1940-1944
1938-1940
1948
1951
circa 1940
circa 1950
1955; 1830
1941
1946
1932-1936
1943
1950
1951
1935
circa 1945
1951
circa 1953
1948
1938
1945
1948
1951
1951
1947
circa 1932
1950
1954
1938
1935
1942
1937
1937
1951
1946
1952
1954
1952
1933
1934