=LDR 22 4500 =001 5108 =082 04$a631.45 TRO =100 1\$aTroeh, Frederick R. =245 10$aSoil and water conservation for productivity and environmental protection =260 \\$aHarlow :$bPearson Education,$c2004 =650 \0$aBooks =700 1\$aHobbs, J. Arthur =700 1\$aDonahue, Roy L. =852 \\$bFreeman Library$h631.45 TRO