A detailed presentation of DNA structures of various types, except for "in
vivo" structures.
http://en.wikipedia.org/w/index.php?title=Special:Book/download/&collection_id=6282a1a1e7ca4ddd&writer=rl&return_to=DNA+structure
Rights:
open access: http://en.wikipedia.org/wiki/DNA_structure
http://en.wikipedia.org/w/index.php?title=Special:Book/download/&collection_id=6282a1a1e7ca4ddd&writer=rl&return_to=DNA+structure
GNU license