Analytical Methods for Coal and Coal Products, Volume III, is the third of a three-volume treatise that aims to provide a detailed presentation of what constitutes the first comprehensive reference work devoted exclusively to the subject of analytical methodology for coal and coal products. The three volumes have been divided into a total of twelve parts, each part containing several chapters devoted to a particular subject. The present volume deals with gases, waste products, by-products, environmental problems, and miscellaneous analytical problems, as well as special instrumental techniques for solving various problems. Because different aspects of a particular subject are frequently scattered through various chapters in the volumes, cross-references between chapters have been entered. In addition, the subject indexes have been made as detailed as was practical, and the reader will benefit from examination of pertinent subjects in the indexes of all three volumes. A careful reading of these volumes will show that definitive solutions are not yet available in a number of instances. There is a clear need for continued research on the fundamentals of analysis of coal and coal products, and the development of reliable and accurate analytical instrumentation, including on-stream applications.