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The Future of U.S. Nuclear Weapons Policy
War in the Modern Great Power System: 1495-1975 (Lexington: University of Kentucky Press, 1983).
U.S. Department of State, Documents on Disarmament, 1945–1956 (Washington, D.C.: U.S. Government Printing Office, 1960), pp. 10–15.
In this context, "weapons-usable fissile materials" are materials that could be used in a nuclear weapon without further enrichment or reprocessing. This includes separated plutonium of any isotopic composition and highly-enriched uranium, as well as unirradiated compounds or mixtures containing these materials.
See, for example, Jonathan Schell, The Abolition (New York: Avon, 1984); and Michael J. Mazarr, "Virtual Nuclear Arsenals," Survival, vol. 37, no. 3 (Autumn 1995), pp. 7-26.