All 1 A.F.G. Hanken releases on Paperback Book
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![Cover for A.F.G. Hanken · Social Systems and Learning Systems - Frontiers in System Research (Paperback Book) [Softcover reprint of the original 1st ed. 1981 edition] (2011)](https://imusic.b-cdn.net/images/item/original/348/9789400981348.jpg?a-f-g-hanken-2011-social-systems-and-learning-systems-frontiers-in-system-research-paperback-book&class=scaled&v=1411226836)