00839nam a2200205Ia 4500 CTU_138564 210402s9999 xx 000 0 und d 631.4 U58 United States Department of Agriculture Natural Resources Conservation Service Soil survey laboratory information manual : United States Department of Agriculture. Natural Resources Conservation Service Lincoln National Soil Survey Center 1995 Contents: Introduction; samplling methodology; soil survey laboratory data reports; primary characterization data sheet; supplementary characterization data sheet. Soil surveys,Thổ nhưỡng Tuyến Trung tâm Học liệu Trường Đại học Cần Thơ