The first three guides posted below are not dated, though I believe the first is from 1983, since it includes images of 1984 GM vehicles. The second guide includes a 1985 copyright and images of 1986 GM vehicles, so I believe that to be from 1985, while the third"Visitor Guide" also has no date, but I believe it to be from 1986. The last brochure, now named a "Souvenir Guidebook" is from 1990, which I know because it actually includes a date on the cover.
[NOTE: Since originally posting this article, I've found an additional World of Motion Guide; the 1985 version has just been added on 9/27/2012)