Saucers Over the Big StackMonte Dolack 18" x 28" 1990 This poster portrays the big stack of the Great Falls Smelter that dominated the landscape of this Montana town for over 80 years. In this mysterious rendering of the smelter, a couple step out of their red 1959 Deluxe Plymouth Fury Convertible to observe some UFOs hovering in a dusky sky. The big stack was destroyed in 1982 beacuse it was reportedly weak enough to pose a safety hazard; for a visual on how the stack came