Analytical gas chromatography, second edition is an excellent reference book for those of us who take gas chromatography seriously, not as a fringe technology, nor learn enough to get by. The second edition was substantially revised from the first edition. Very up to date information with insights on why things appears in certain way. Chapter 5, variables in the gas chromatographic process, and chapter 6 (subsection 9), optimizing operational parameters for specific columns, and chapter 8 on selective tuning are very useful and invaluable.