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1.

図書
図書
1. Earthquake engineering : Proceedings of the Third European Symposium on Earthquake Engineering, Sofia-Bulgaria, September 14-17, 1970
European Symposium on Earthquake Engineering ; European Commission on Earthquake Engineering ; Bulgarian National Committee on Earthquake Engineering ; Bŭlgarska akademii︠a︡ na naukite
出版情報: Sofia : Bulgarian Academy of Sciences Press, 1971
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2.

図書
図書
2. Българско-английски речник
Г. Чакалов, Ил. Ляков, Здр. Станков
出版情報: София : Държавно изд-во "Наука и изкуство", 1961
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