@book{2419,
	author = {International Board for Soil Research and Management (IBSRAM)},
	title = {Evaluation for sustainable land management in the developing world v.1 : towards the development of an international framework : proceedings of the international workshop, Chiang Rai, Thailand 15-21 September, 1991},
	publisher = {IBSRAM,},
	year = {1991}
}