alpine-climbing alpinism biologicalsciences camping climbing cookbooks cooking cookingeducation crafts design dieting ecology encyclopedias entertainment excursionguides exercise extreme-sports fitness folklore food forests games gear-selection general health hiking hobbies home homeimprovement homeimprovements how-to humor ice-climbing math mountain-rescue mountainclimbing mountaineering mythology naturalresources nature outdoor-adventure outdoors plants puzzles rainforests reference risk-management rock-climbing rope-systems route-planning safety-techniques science sports subjectguides summiting survival-skills survivalskills technical-skills training travel trivia weather-forecasting wilderness-exploration wine