CHEVROLET 1985-91 "M" series Astro Vans factory parts and illustration book.  January 1991 is the effective date for this must have book.  Anyone owning or restoring a Chevrolet Astro Van "M" series of this era needs this book to research the parts and the illustrations to view the exploded diagrams for assembly or reassembly. Seeing the exploded views will help in taking it apart and putting it back together,  This book is 2 inches thick!