Guidebooks may be compilations of selected popular or well-regarded routes (e.g.
Fifty Classic Climbs of North America or
Hard Rock), or exhaustive compilations of all known climbing routes in a region (e.g. the 512-page
Lancashire Rock in Britain). The books may be published by national/regional mountaineering bodies (e.g. the
British Mountaineering Council and
Climbers' Club in Britain, the
Club Alpino Italiano in Italy, or the
Sierra Club in the US), by commercial publishers (e.g. Rockfax and Cicerone in Europe or Falcon Guides, Wolverine, and SuperTopo in the US), or self-published by local enthusiasts, which is how climbing areas get started. Regardless of publication, in many cases, the authorship of the climbing guidebook will explicitly (i.e. named on the front cover), or implicitly (listed as contributors/advisors), include well-regarded climbers who are associated with the climbing area in question. There are however notable climbing guidebook authors who are not specifically associated with an area, but whose authorship and climbing insights are equally well-regarded, examples being Britain's
Ken Wilson and America's
Steve Roper, who wrote many notable climbing guidebooks for a wide range of locations and types of rock in their respective countries. The task of re-grading existing climbs, and ensuring that the guidebook accurately and fairly reflects the assessments of respected climbers in the area, can be lengthy—and can lead to many heated debates amongst climbers, This medium offers the benefit of continuous updates, as well as rapid searching, and in some cases, GPS navigation and
three dimensional diagrams. There are now several major online climbing route databases including 'theCrag.com' and '
MountainProject.com', however, climbing authors note that the need for 'physical guidebooks' that can be carried by climbers to (often) remote crags remains (many have physical and online editions). ==Influence and notable books==