00346naa a2200121 a 450000100080000000500110000800800410001910000190006024500480007926000090012770000180013677300700015412794591991-01-31 1980 bl --- 0-- u #d1 aNIELSEN, G. A. aCrop yields on native soils and mine soils. c19801 aMILLER, E, V. tJournal of Soil and Water Conservationgv.35, n.1, p.44-46, 1980.