1. Evenkya: almost 800,000 km2; Texas: almost 700,000 km2; and Ukraine: a little above 600,000 km2.
2. See The Tunguska Phenomenon: Multifariousness of the Problem. Novosibirsk: Agros, 2008; The Centenary of the Tunguska Problem: New Approaches. Moscow: Binom, 2008; The 100th Anniversary of the Tunguska Phenomenon: Past, Present, Future. Moscow, 2008; The 100th Anniversary of the Tunguska Comet Body. St Petersburg, 2008; The Centenary of the Tunguska Meteorite Fall: A Relay Race of Generations. Krasnoyarsk: IPK SFU, 2008 (All in Russian.).
3. Boslough, M. B. E., and Crawford, D. A. Low-altitude airbursts and the impact threat. – Proceedings of the 2007 Hypervelocity Impact Symposium – International Journal of Impact Engineering, in press (2007).
4. See Bronshten, V. A. The Tunguska Meteorite: History of Investigations. Moscow: A. D. Selyanov, 2000, pp. 223-225 (in Russian)
5. Olkhovatov, A. Y. The Myth About the Tunguska Meteorite. The Tunguska Event of 1908 as a Mundane Phenomenon. Moscow: Association Ecology of the Unknown, 1997, pp. 101-102 (in Russian).