American Crystallographic Association (ACA) - - Includes a newsletter, information on annual conferences, information on careers and positions available, and related links.
British Crystallographic Association (BCA) - - Includes information about the activities of its groups, conference information, index and introduction to its newsletter, and related links.
European Crystallographic Association (ECA) - - Includes minutes and reports of its executive council and groups, conference information, related news and lists of officials and rules, as well as membership information.