Mike Pacak's Pinball flyer reference book
This 'book' actually a set of 3 books, as you can see in the picture. I don't think it's still for sale new, but used copies show up on ebay and other pinball websites..
In short, its a reference of every pinball machine flyer from 1947 to 1997. Black and white copies, only the front side of each flyer.
with the internet and sites like the Internet Pinball Database and The Pinball Flyer Site, this book isn't a must anymore for pinball collector to own.. now you can look up each flyer in color online.
But still it's interesting to have as a collector, sometimes you don't want to switch on your computer and quickly take a book and see what a game is all about.. or just browse the books and learn about games you never heard about from before or read their 'feature-o-gram'.