Don't forget there is George's own technicolour print.
There is also this:
Lucasfilm, founded by director George Lucas, has gone to great lengths to preserve film, paper records and artifacts related to its productions.57 To use Star Wars (1977) as an example, Lucasfilm's distributor keeps the usual master cut negative and printing materials in a climate-controlled vault but, in addition, Lucasfilm has retained all other production elements. The firm has built its own archives building to house these materials.
SNIP
To return to the Star Wars example, the Library of Congress has copyrighted release prints and reference videodiscs, but the distributor Twentieth Century Fox holds extensive preprint materials and some circulation copies, and Lucasfilm maintains other production elements.
http://www.loc.gov/film/study.html