Berg, G. V. (1964). The Skopje, Yugoslavia earthquake, July 26, 1963. New York: American Iron and Steel Institute.
Παραπομπή Chicago StyleBerg, Glen V. The Skopje, Yugoslavia Earthquake, July 26, 1963. New York: American Iron and Steel Institute, 1964.
Παραπομπή MLABerg, Glen V. The Skopje, Yugoslavia Earthquake, July 26, 1963. New York: American Iron and Steel Institute, 1964.
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