1. From 507 tons in 1945 to 31,564 in 1965. Nuclear Energy Agency (ed.), The Red Book Retrospective. Fourty Years of Uranium Resources, Production and Demand in Perspective (Paris: OECD, 2006 [1965]), 89–91.
2. On the role of these missions see: Michael Goodman, Spying on the Polar Bear (Stanford: Stanford University Press, 2007), chap. 1;
3. Simone Turchetti, The Pontecorvo Affair (Chicago: University of Chicago Press, 2012), chap. 2.
4. For global intelligence see: Simon Schaffer, Lissa Roberts, Kapil Raj and James Delbourgo (eds.), The Brokered World: Go-Betweens and Global Intelligence, 1770–1820 (Sagamore Beach, MA: Science History, 2009).
5. On hybridization: John Krige, “Hybrid Knowledge: the transnational co-production of the gas centrifuge for uranium enrichment in the 1960s,” British Journal for the History of Science 45:3 (2012): 337–358.