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The Dobbin barn was obtained as a pre-cut building from the Des Moines firm. It was listed in the company's catalogue as “Barrel Barn No. 214.” The diameter of the vertically wood-sided barn is 60 feet; within, at the center, is a terracotta silo 12 feet in diameter. The roof is of the double-pitch gambrel type, with a large cupola on top. The cupola has louvered windows, and a wide overhanging cone-shaped roof.