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.Íàöèîíàëíà ó÷èëèùíà êîíôåðåíöèÿ `Ñïîäåëåíè ïåäàãîãè÷åñêè ïðàêòèêè â ïðåïîäàâàíåòî íà ïðèðîäíè íàóêè` [ñáîðíèê:ãîäèøíèê] / 51 ñðåäíî ó-ùå Åëèñàâåòà Áàãðÿíà . - Ñîôèÿ : 51 ñðåäíî ó-ùå Åëèñàâåòà Áàãðÿíà, 2019-. - 20 ñì

.ISSN 2683-0744
.ÓÄÊ 5
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