=LDR 22 4500 =001 2673 =082 04$a551 GRE =245 00$aHuman activity and environmental processes =260 \\$aChichester :$bWiley,$c1987 =650 \0$aBooks =700 1\$aGregory, K. J. =700 1\$aWalling, D. E. =852 \\$bFreeman Library$h551 GRE