Description of Green Trails Maps Detroit Green Trails, Inc founded in 1973, publishes over 140 topographic recreation map titles for the most spectacular mountain, beach, canyon and urban areas of North America. Green Trails maps show the most current trail, road, and access information in the most clear, compact, and convenient format and scale available. See samples, or read Testimonials about their award winning maps. Features: Original Issue 1987 Current Issue 1998 Edition 0 Scale 1:69500 Inset Scale NA Projection Lambert Conformal Conic UTM Zone 10 Datum NAD27 Sheet Size 12 x 18 Fold No Features Detroit Lake Campgrounds and Boat Ramps, Middle Santiam Wilderness