00298nam a2200109Ia 450000500170000000800410001708200150005810000190007324500470009226000410013930000080018020260224041012.0260224s9999||||xx |||||||||||||| ||und||  a631.45 MOR  aMorgan, R.P.C. 0aSoil conservation: problems and practice    aChichester: John Wiley & Sons c1981  a576