This is a reprint of a great reference book. How often have you searched for conversion tables and equivalent lists? This book is a compilation of graphs, tables and charts. Provides info on water chemistry, vapour pressure solubility, densities and salinities. Converts units of power, temperature, feet head and water pressure. Hatchery info for toxicity levels, oxygen consumption, and nitrification rates. Plumbing specifications, heat transfer, and mechanical properties of various building materials. Chemicals and treatments etc. A very useful book with 222 pages