
Crick and Watson's DNA Molecular Model
1953
1953
1953
1920-1950
1934
1935
1951
1948-1953
1955
1950-1952
1936
1935
1955
1942
1951-1953
1920-1950
1920-1930
circa 1956
1949
1945-1955
1920-1950
circa 1956-1959
1948-1950
1950
1956
1953
1959
1945
1939-1955
1936
1946
1921-1930
1920-1940
1920-1925
1953
1946-1950
1839 (original); circa 1988 (replica)
1948
1940
1949
1936-1948
1940-1945
1920-1950
1920-1950
1920-1950
1930-1950
circa 1939
1925-1935
1943
1935-1945
1936