How do we protect our environment? : information, facts and data from the GDR
著者
書誌事項
How do we protect our environment? : information, facts and data from the GDR
（First-hand information / editors: Lilli Piater and Steffi Liedtke）
Panorama DDR, [1974]
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注記
"Editing completed on 10 January 1974"--t.p. verso