=LDR 00000nam a2200000ui 4500 =001 6184 =008 250611s1990\\\\xx\|||||||||||||||||eng\d =020 \\$a90 5410 464 3 =082 04$a551.49 DRE =100 1\$aDrew, David =245 10$aKarst Hydrogeology and Human Activities =260 \\$bA.A.Balkema,$c1990 =700 1\$aHotzl, Heinz =852 \\$bGeography Basement$cBooks$h551.49 DRE