1 Bouma, J.; Kuyvenhoven, A.; Bouman, B. A. M.; Luyten, J. C.; Zandstra, H. G. (Eds.) 1995. Eco-regional approaches for sustainable land use and food production: Proceedings of a symposium on eco-regional approaches in agricultural research, 12-16 December 1994, ISNAR, The Hague. Dordrecht, Netherlands: Kluwer. xiii, 505p. (Systems approaches for sustainable agricultural development, volume 4)