Northwest Europe and North America
Recently the city of Regensburg published a new brochure entitled "OWHC and the Region North-West Europe" with detailed information about the Organization of World Heritage Cities, its mission and its members. In January 2013 an exhibition follows, which deals with the same topic. It starts with a Skype Conference between Regensburg and the OWHC Headquarter in Quebec.
The OWHC brochure you find here: http://www.regensburg.de/sixcms/media.php/280/OWHC-Broschuere.pdf