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Óñòîé÷èâî ðàçâèòèå íà Áúëãàðèÿ... [ñáîðíèê:äðóãà] = Sustainable Development of Bulgaria... / ÍÑÈ
. - Ñîôèÿ : ÍÑÈ, [2008-]. - 24 ñì
ISSN 1313-972X
ÓÄÊ 311
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