00298nam a2200109Ia 450000500170000000800410001708200150005810000170007324500460009026000440013630000080018020260224041013.0260224s9999||||xx |||||||||||||| ||und||  a631.47 WES  aWestern, S.  0aSoil survey contracts and quality control  aLondon: Oxford University Press, c1978  a284