Classic ViewMaster - United States Travel - Carlsbad Caverns National Park- Tour One- ViewMaster Reels 3D - Unsold store stock - never opened 3 reel ViewMaster set United States Travel - Tour One - Calsbad Caverns National Park - vintage - unnopened never owned Illustrated booklet included You will need a ViewMaster viewer to view the reels - available here on Amazon. Be the first to open this unsold store stock from the 1970s.