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![Cover for UN Economic Commission for Europe · Improved Techniques for the Extraction of Primary Forms of Energy: A Seminar of the United Nations Economic Commission for Europe (Vienna 10-14 November 1980) (Paperback Book) [Softcover reprint of the original 1st ed. 1983 edition] (2012)](https://imusic.b-cdn.net/images/item/original/512/9789400966512.jpg?un-economic-commission-for-europe-2012-improved-techniques-for-the-extraction-of-primary-forms-of-energy-a-seminar-of-the-united-nations-economic-commission-for-europe-vienna-10-14-november-1980-paperback-book&class=scaled&v=1447417207)
![Cover for UN Economic Commission for Europe · Efficient Use of Fertilizers in Agriculture - Developments in Plant and Soil Sciences (Hardcover Book) [1983 edition] (1983)](https://imusic.b-cdn.net/images/item/original/664/9789024728664.jpg?un-economic-commission-for-europe-1983-efficient-use-of-fertilizers-in-agriculture-developments-in-plant-and-soil-sciences-hardcover-book&class=scaled&v=1604690601)