=LDR 00000nam a2200000ui 4500 =001 163 =008 250530s1981\\\\xx\|||||||||||||||||eng\d =082 04$a551.31 CRA =100 1\$aCrampton, C. B. =245 10$aAnalysis of synergistic systems for evaluating terrain sensitivity to disturbance of icy permafrost in the Mackenzie River valley, Canada =260 \\$bBiuletyn peryglacjainy,$c1981 =852 \\$bFreeman Library$cPamphlets$h551.31 CRA