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Íàó÷íè òðóäîâå íà Íàó÷íî-èçñëåäîâàòåëñêèÿ èíñòèòóò ïî îõðàíà íà òðóäà [ñáîðíèê:ãîäèøíèê] / ÌÍÇÑÃ
. - Ñîôèÿ : Ïðîôèçäàò, 1957. - 21 ñì
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ÓÄÊ 613.6+331.4
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