It's that time of year to revise. So I hope I can be forgiven for posting a reminder of a very useful booklet, "Avalanche Know-How", 73 pp., by Günter Durner and Brian Farquharson, translated by Ella Schierbeek. Self-published by Günter and available from him at http://www.am-berg-verlag.de, from Brian, from SCGB online (Books), and from Amazon.