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![Cover for N.J.T.A. Kramer · Systems thinking: Concepts and notions (Paperback Book) [Softcover reprint of the original 1st ed. 1977 edition] (1977)](https://imusic.b-cdn.net/images/item/original/874/9789020705874.jpg?n-j-t-a-kramer-1977-systems-thinking-concepts-and-notions-paperback-book&class=scaled&v=1566725027)