Excellent. Although published in 1987, and therefore lacking, eg., computer terms and modern idioms, the illustrations and encyclopaedic nature of these volumes are something to be treasured. I was unable to find a modern equivalent . It also has brief graphic essays on many topics, eg., world religions, types of sailing ships, flags of the world, the layout of a cathedral, various schools of art, and lots more. A British ed., 1984, was also published.