Andre wrote:
Does anybody know a good (extensive) book about avalanches?

russ wrote:
If extensive is what you're looking for I'd go with "Staying Alive in
Avalanche Terrain" by Bruce Tremper.
Very detailed and very well written. Does a great job with the
technical snow science stuff as well as with the human factor/decision
making stuff.

on a related note (Bruce T. is mentioned in the article), everyone who
will head into the backcountry should read this:

What's Wrong with Traditional Avalanche Courses?
by David Spring
http://www.adventureplus.org/avalanche.htm

very important and sobering stuff...

Tom