I have the 1976 release. With the Mcquarrie cover signed by Alan Dean Foster. Would have to search for it and dig it out.
There are no differences in the text between the editions, as far as i know.
The copy i have is worn. It is not in unread condition. And yet the binding is intact unlike my first edition return of the jedi the illustrated edition, or warped like my empire strikes back illustrated first edition.