The three previous volumes collected works from 1958 - 1970, 1971 - 1982 and 1983 - 1987. (artbook.com)
A book based on editing and recycling previous volumes, James Owen's The Times Great Letters A Century of Notable Correspondence (Times Books) is a good standby for long Brexit debates. (totalpolitics.com)
Previous volumes covered classical physics (SN: 4/20/13, p. 30) and quantum physics (SN: 6/14/14, p. 29). (sciencenews.org)