=LDR 22 4500 =001 5110 =082 04$a631.4 BEN =100 1\$aBennett, Hugh Hammond =245 10$aSoil conservation =260 \\$aNew York :$bMcGraw-Hill,$c1939 =650 \0$aBooks =852 \\$bFreeman Library$h631.4 BEN