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      26 
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	[книга]
	Modern management of mine producing, geology and environmental protection
	International Scientific Conference Surveying, Geology, Ecology, Management, VI. Varna. 2006
	[София : STEF92 Technology]
	2006
ISBN:
:	Vol. 1.  . - 470 p. : ill ISBN 954-91818-1-2   Vol. 2.  ISBN 954-91818-1-2
	Екология - конференции Геология - конференции Минно дело

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