=LDR 22 4500 =001 5384 =082 04$a2000 O'C =100 1\$aO'Connell, Niamh =245 10$aA study of the impact of arterial drainage maintenance on stream invertebrates =260 \\$aDublin :$bUniversity of Dublin, Trinity College,$c2000 =650 \0$aDissertations =852 \\$bGeography Basement$h2000 O'C