Just having a little fun thinking of some of the thinnest books in the pinball library...all in good fun, no offense intended...
THE ART OF CONVERSATION by Tim Arnold
INFORMATION: ITS IMPORTANCE AND HOW TO SHARE by Skit b
10 TIPS ON RELEASING PINS WITH COMPLETE CODE by Gary Stern (foreword by Jersey Jack)
FAIR BUSINESS PRACTICES by Choggard
KEEPING A LOW PROFILE a compilation by O-din, Aurich and RobT
USEFUL CONTRIBUTIONS TO PINSIDE by cosmokramer
HOW TO BE SERIOUS ALL THE TIME by labnip
Feel free to add your own...