This Combination Package offers two essential reference books together at a discounted price:Hawley s Condensed Chemical Dictionary, 15th Edition is a compilation of technical data and descriptive information covering thousands of chemicals and chemical phenomena, trade name products, processes, reactions, products, and related terminology. It is organized to meet the needs of those who have only minutes to devote to any given substance or topic.Sax's Dangerous Properties of Industrial Materials, Eleventh Edition, like its successful previous editions, contains extensive data to fill the information needs of professionals who must work with and evaluate the hazards of chemicals.