The Antiquarian Booksellers Association (ABA) is the senior trade body for dealers in antiquarian and rare books, manuscripts and allied materials in the UK and its membership also includes many leading booksellers from overseas. Members are elected solely on the basis of proven experience, expertise and integrity and they guarantee the authenticity of all material offered for sale and ensure all items are properly described. The ABA runs book fairs in Edinburgh in March and in Chelsea in November as well as Firsts London.