William Sanderson (1905-1990), Hills of Wyoming, 1979, oil, 18 x 22. Estimate: $5,000-$7,000. ← Previous Next → William Sanderson (1905-1990), Hills of Wyoming, 1979, oil, 18 x 22. Estimate: $5,000-$7,000. William Sanderson (1905-1990), Hills of Wyoming, 1979, oil, 18 x 22. Estimate: $5,000-$7,000.