A tiny book filled with useful factual data. Topics covered include: air and gases; automotive; carpentry and construction; chemistry and physics; computers; physical, chemical and mathematical constants; electrical; electronics; first aid; general information; science; geology; glue, solvents, paints and finishes; hardware; math; mine, mill and aggregate; money; plumbing and pipe; rope, cable, chain and knots; steel and metals, surveying and mapping, tools, water, weather, properties of materials; welding; and a 14 year perpetual calendar.