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International Young Pioneers, Seminar-camp on Nature Conservation, held at Druzhba Near Varna, Bulgaria, 21 May–1 June 1974
Čeřovský, JanVolume:
1
Language:
english
Journal:
Environmental Conservation
DOI:
10.1017/s0376892900005014
Date:
December, 1974
File:
PDF, 264 KB
english, 1974