Bubble over Coyote footings 1977

For sale: one air-inflated vinyl-coated nylon "bubble" slightly used. Covers more than one city block (slightly over 2 acres) 360 ft. long, 260 ft. wide, 60 ft. high. Could be used for indoor tennis courts. Expected life span = 20 years. Initial cost $350,000. This bubble happened to be over the footings of Coyote Power Plant south of Beulah, ND the winter of 1978-79. We worked in a long sleeve T-shirt and jeans all winter - while it was 40 degrees BELOW outside! Never did hear who bought the bubble...!