=LDR 22 4500 =001 4974 =082 04$a551.49 DAL =100 1\$aDaly, D. =245 10$aSeptic tank systems and groundwater in Ireland =260 \\$aDublin :$bGeological Survey of Ireland,$c1993 =650 \0$aBooks =700 1\$aHenry, H. =700 1\$aThorn, R. =852 \\$bFreeman Library$h551.49 DAL