Papers of Colonel William de Lemos Milles ('Toby') Messenger, 1945-1994, relating to atomic tests and British nuclear policy, 1945-1989, including Messenger's report on effects of atomic blast on a Challenger tank, Australia, 1953 (Exercise TOTEM); manuscript draft article by Messenger on observing a nuclear explosion and pamphlets on nuclear weapons, 1945-1982 and papers relating to Messenger's position as Scientific Advisor (Nuclear) to Northhampton County Council (NCC) Emergency Planning, 1980-1993, including an appreciation of Exercise WET FINGER run by the NCC, [1988]; NCC emergency plans for radiation incidents; training manual for scientific advisors; files of notes, articles and other papers on the following topics: improving methods for obtaining bomb burst data, improvised bomb data, chemical and biological warfare, meteorology, victims of disaster, public reaction to nuclear technology, nuclear electromagnetic pulse, nuclear winter, casualty prediction, chemical and biological hazard protection and health, water, food, agriculture and energy after a widespread disaster; and publications including journal Fission Fragments, 1982-1992 and Civil Protection Magazine, 1991-1994.