"The only book you really need. Concise, circumspect, and practical. Learn why bears behave the way they do and how to safely navigate their territory. See also the author's blog at http://bearinformation.blogspot.com/"
"If you have any doubt about your ability to make enough noise, use an airhorn to periodically warn animals in the area of your presence. Can also be used to scare away a bear during a close encounter."