All About Aurora Postage Stamp Trains
1968 Bus System Set Instructions
Accompanying most bus sets was this 12-page, 8-1/4" x 11-5/8" (A4, European standard letter size) instruction booklet, printed in Germany by Faller. In addition to instructions for the bus, this colorful, detailed booklet also presents a substantial list of accessories, many of which may never have been released as Postage Stamp products.
Booklet pages link to larger images.
One thing I find intriguing about this booklet is that it even includes detailed internal schematics of the electrical accessories. I can't imagine these would be understood by very many hobbyists (especially these days), but kudos to Faller for doing so anyway.