When introduced in 1971, the boattail Riviera had its part in the Buick brochure but there also was a Riviera Only brochure. This (today hard to find brochure) contains a score of nice pictures.
On the cover you will find a business card with a 'handwritten' message of O.F. Frost, general sales manager from the Buick Motor Devision. It's printed (ofcourse) and says "I hope you'll experience Riviera as I have... behind the wheel".