Staying Alive in Avalanche Terrain by, Bruce Tremper is widely considered the definitive book on Avalanche education and safety. The book reviews such topics as how avalanches work, terrain management, weather, snowpack, stability as well as what to do in the event you need to rescue your ski pal.
You can buy a Kindle Edition for just $9.99 or a paperback for just $12.00.
NOTE: If you are serious about avalanche safety FIRST go out and get your AIARE Level 1 THEN read this book.