Click on the pictures above for better resolution. Notice the ads on these pages. Comtrex and Dodge appear on the inside of the brochure. Notice the Camel Ads on the map pages. Kind of funny that skiing, a healthy sport, would have a tobacco product as a sponsor, but we see this on a Killington ad of the same time period.
Both of these were published by 1978 Ski Guides and are from the late 70's or early 80's.