Peaks Section or the Adirondack Forty-Sixers. Alpine clubs may include peak bagging as one of the activities in which its members may participate; notable alpine clubs that maintain peak bagging lists include the Scottish Mountaineering Club, the Mazamas of Oregon and the Mountaineers of Washington. Other clubs may promote the climbing of peaks on a peak bagging list they do not maintain, or they may create an authoritative version of a list that is already popular; a reflection of this is the relationship between the 4000m peaks of Alps and the UIAA. Clubs maintain listings of people who have completed peak bagging lists, and also provide opportunities for social interaction, such as through outings and club events. Books Another source of lists come from mountaineering guidebooks that detail information about how to climb peaks in a certain region. Mountaineers will often try to climb all or some of the peaks described in these books. 100 Famous Japanese Mountains, Fifty Classic Climbs of North America, and the Alpine Club Guides are notable examples of such books. Reaching a summit Generally, the summit block has to be reached and the climber must touch or be within a few horizontal meters of the highest point. However this convention is not universal, due to the varying objectives of individual peak baggers. Many clubs have special rules that attempt to address various considerations. Some peak baggers increase the challenge of summiting a list of peaks in various ways, such as by requiring a minimum vertical climb per peak, climbing within a time limit, climbing in different seasons (such as winter), or climbing the same peak multiple times by different routes. Traditional mountaineers and climbers may elect to only go up routes with certain climbing grades Various organizations have adopted rules for what to do when a peak is on private land or otherwise inaccessible, whether off-road vehicles may be used, etc. Summit logs In some parts of the world, a summit register or summit log may be located in a watertight container such as a jar or can, stashed in a protected spot. Peak baggers often will write a note or log entry and leave it in the "summit log" as a record of their accomplishment. Increasingly, peak baggers are also logging their summits online by signing virtual summit logs. One popular website is peakbagger.com, founded by Greg Slayden, which lists mountains and regional highpoints.