Clyde Aspevig, Pawnee Buttes, oil, 20 x 24. Estimated: $8,000-$10,000. ← Previous Next → Clyde Aspevig, Pawnee Buttes, oil, 20 x 24. Estimated: $8,000-$10,000. Clyde Aspevig, Pawnee Buttes, oil, 20 x 24. Estimated: $8,000-$10,000.