1. Central Intelligence Agency, USSR Energy Atlas. Washington, D.C.: U.S. Government Printing Office, 1985.
2. Ibid.
3. R.D. Speed, Strategic Forces: Future Requirements and Options. Livermore, Calif.: Lawrence Livermore National Laboratory, Report UCRL-ID-105336, November 1990, pp. 52-53.
4. U.S. Department of Defense, Soviet Military Power 1990. Washington, D.C.: U.S. Government Printing Office, 1990; International Institute of Strategic Studies, The Military Balance 1990-1991. London: IISS, 1990, pp. 28-43