=LDR            22        4500
=001  937
=082  04$a1983 O'B
=100  1\$aO'Brien, Paul
=245  10$aA comparitive study of the sequential comparison index and some other biological indices of water quality
=260  \\$aDublin :$bUniversity of Dublin, Trinity College,$c1983
=650  \0$aTheses
=852  \\$bGeography Basement$h1983 O'B