HTML 3.0: Electronic Publishing on the World Wide Web
Addison Wesley Search Addison Wesley by D. Raggett J. Lam I. Alexander Search D. Raggett I. Alexander
Customer Reviews:Best HTML reference book I've seen. 
I'm a web page designer and I have used many HTML reference books, and "Definitive Guide to HTML 3.0; Electronic Publishing on the World Wide Web" by Dave Raggett is the best one I've seen.
It is concise and to the point, gives all the relevant examples, and its appendices are invaluable! Whenever I want to look up something during the web page design process, I reach for this book because I know the answer I'm looking for is in there.