Correspondence has been arranged alphabetically by name of organisation rather than signatory. American spelling for 'Center' has been retained for American organisations. Examples of types of organisations include: scientific, research and academic; educational; commercial companies (engineers, equipment, electrical, medical); political; peace organisations; nuclear and anti-nuclear; charities / foundations; publishers and booksellers; publications, newspapers and magazines; solicitors; broadcasters and the press; environmental; medical, health and hospitals; religious; cultural; governmental; legal. Organisations include those abroad, such as Germany, France, Russia, America and European and International Organisations. Some of these organisations are also represented in the Series RTBT 10 and have been cross-referenced accordingly.