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Symposium on the Gas Situation in the ECE Region Around the Year 1990 (1978 : Evian, France)
ScienceDirect http://www.sciencedirect.com/science/book/9780080244655
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United Nations. Economic Commission for Europe. Committee on Agricultural Problems.
ScienceDirect https://www.sciencedirect.com/science/book/9780080244563
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