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Proceedings of the Workshop on efficient use and maintenance of irrigation systems at the farm level in China
- 851.1
- United Nations,
- 1979.
- New York, NY :
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The structure and behaviour of enterprises in the chemical industry and their effects on the trade and development of developing countries : study / prep. by the UNCTAD secetariat ; with the ass. of R.H. Yates.
- United Nations,
- 1979.
- [New York] :