
Crick and Watson's DNA Molecular Model
1953
1953
1953
1934
1948-1953
1839 (original); circa 1988 (replica)
1940
1951
1938
1947
1938
1948
1938
1935
1938
1940
1928
1935
1940
1936
1934
1950
1932
1955; 1830
1950
1935
1951
1949
1940-1945
1927-1929
1945
1948
1946
1943
1948
1935-1945
1950
1932-1936
1934-1935
1934
1937
1931
1931
1949
1951
1953
1946
1942
1927
1937
1930