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Monograph

Langeveld, J.W.A. (1994). Nutrient Efficiency in Dairy Farming: Nitrogen, Phosphorus, and Potassium Use in the Netherlands, Spain, and Poland. IIASA Working Paper. IIASA, Laxenburg, Austria: WP-94-014

Other

Voortman, R.L., Sonneveld, B.G.J.S., Langeveld, J.W.A., Fischer, G. & van Velthuizen, H.T. (1999). Climate Change and Global Agricultural Potential: A Case Study of Nigeria. Centre for World Food Studies, International Institute for Applied Systems Analysis (IIASA) , Amsterdam, Netherlands; IIASA, Laxenburg, Austria. wp-99-06.