Scrooge McDuck is now such a fixture in the Disney universe that few remember Carl Barks had been writing and drawing Donald Duck stories for half a decade before he cooked up the miserly multiplujillionaire -- for what he thought would be a one-time Christmas yarn involving Donald, the nephews, Scrooge in a bearskin, and (inevitably) a couple of real bears. "Christmas on Bear Mountain" is one of Barks's funniest holiday stories and a true landmark...