9.
World map of the status of humaninduced soil degradation, oldeman, L. R., Hakkeling, R. T. A. and Sombroek, W. G. UNEP/ISRIC, Nairobi, Kenya, 1990. isbn 90 6672 042 5, US$25.00 (paperback), 3 maps and explanatory note + 27 pp.
机译:World map of the status of humaninduced soil degradation, oldeman, L. R., Hakkeling, R. T. A. and Sombroek, W. G. UNEP/ISRIC, Nairobi, Kenya, 1990. isbn 90 6672 042 5, US$25.00 (paperback), 3 maps and explanatory note + 27 pp.