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2
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Regional integration among developing countries : survey of past performance and agenda for future policy action / Rolf J. Langhammer and Ulrich Hiemenz.
- World bank. Trade policy division,
- 1991.
- Washington, DC :
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Anaerobic digestion : principles and practices for biogas systems / Charles G. Gunnerson and David C. Stuckey ; with major contrib. by Martin Greeley, Rolf T. Skrinde, and Roscoe F. Ward.
- World Bank,
- 1986.
- Washington, DC :