Which was Rosilynd Franklin's contribution to discovering DNA

Rosalind Elsie Franklin (25 July 1920 - 16 April 1958) [1] was a British biophysicist and X-ray crystallographer who made critical contributions to the understanding of the fine molecular structures of DNA, RNA, viruses, coal and graphite.[2] The DNA work achieved the most fame because DNA (deoxyribonucleic acid) plays ...