In reply to J Whittaker:
It's a Bruce, but it's Bruce Tremper. Really good book, very detailed, aimed mostly at skiers but avalanches don't really care who they hit... He also has a condensed version called Alpine Essentials.
Bruce Goodlad does however have a book called intro to alpine climbing, haven't read that but I found his intro to ski touring very useful and it had a section on avalanches.
Books like Freedom of the Hills covers avalanches but can't remember to what extent (it's a dense book though!) and my copy of it has disappeared since lending it out!
Hope that helps