Here’s an original 1993 Buick 90th Anniversary Media Information Press Kit.
The folder contents had the following items:
Buick Celebrates 90th Anniversary in 1993
Buick Tracks Its Oldest Surviving Cars in Preparation for 90th Anniversary
Buick Heritage Notes
36 pages of information + 6 photos + 3 slides.
Measurements of the folder: 9″ wide x 12 tall.
(find it on ebay for about $40 if you want it in your Buick literature collection)