Muller, Hans-Werner Measures on the soil amelioration potential of rock phosphates in oxisols and ultisols - Tubingen Institute for Scientific Co-operation 1989 - pp. 7-20 - v.29 . Subjects--Topical Terms: FOSFATOSSUELOS Subjects--Geographic Terms: PERUBAYOVARPIURA Universal Decimal Class. No.: 330.15(082.1)/I59|12