Order of authorship in the original publication: Rosenberg, Seeman,...Rich. This paper was the first confirmation of the double-helix structure at atomic resolution.
See also:
Roberta Ogilvie Day, Nadrian C. Seeman,... Alexander Rich, "A crystalline fragment of the double helix: The structure of the dinucleoside phosphate guanylyl-3'5'-cytidine," Proc. Nat. Acad. Sci. (U.S.A.) 70, 849-853. Digital facsimile from PubMedCentral at this link.

(Thanks to Juan Weiss for this reference and its interpretation.)