Are you becoming a fan of the 51 and looking for basic info? Get a copy of the 1951 Buick Sales Brochure - it is cheap and a good introduction!
The 53 Buick Skylark was the 50th anniversary model. Read the 1953 Buick Skylark Convertible Top Operating Guide to get operting tips for the folding top!
The 1944 Buick Dealership Building Layout Guide is an iconic piece of Car Dealership Architecture. It displays many proposals for the outside and inside design of Buick dealerships. This book is very hard to find!