Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor quality

I have every C&D from the 3d edition. I bought this copy solely to study for the DABT exam. Imagine my surprise when I stat to look for citations in the index, and things like formaldehyde and methylene chloride are not there at all, even though there's a full page on MC in the book. While the index of the 6th edition is 39 pages, this one only has 16. If you are buying this to read full chapters, you're probably OK, but if you're looking up specific items, good luck. After full satisfaction with 4 editions in a row, they really went cheap on this one.