na INLIS000000000011318 Ind 0010-1118011318 Classification problems of selected soil profiles from North-Sumatra (Indonesia) according to the USDA soil Taxonomy system ADIWIGANDA, Mamat Rachmat Mamat Rachmat Adiwiganda Ghent The stale university of ghent 1986 iv, 97 p.: ill.; 29 cm. iv, 97 p.: ill.; 29 cm. 631.44ADIc Thesis- (Dr). The state university of ghent, 1986 631.44 SOIL STRUCTURE NORTH SUMATRA 754/DTS/90-mfn13101