00824nam a2200217Ia 4500 CTU_138566 210402s9999 xx 000 0 und d 631.4 U58 United States Department of Agriculture Natural Resources Conservation Service Soil survey methods manual : The soil survey analytical continuum United States Department of Agriculture. Natural Resources Conservation Service Lincoln National Soil Survey Center 1996 The purpose of this manual is to document methodlogy and to serve as a reference for the laboratory analysyst. Soil surveys,Thổ nhưỡng Tuyến Trung tâm Học liệu Trường Đại học Cần Thơ