This is subtitled ""A one-volume encyclopedia explaining the miracles of modern science, invention and industry, and the wonders of nature"". Don't confuse it with the many volumed Book of Knowledge. Remember instead its own predecessor- and rejoice in the excellent revision, complete re-setting and remarking of this first rate reference volume of modern science. There are about 600 fine photographs, illustrating the story of invention and the men and women behind the inventions. More than fifty topics are included as varied in scope as atomic energy, wonder drugs, radar, photography, jet propulsion, salt, textiles, weather, bridges, paper, steel, deep sea diving, printing, and dozens of other topics. A sturdy piece of book-making which will stand hard usage which it is sure to get in school libraries.