=LDR 22 4500 =001 2913 =082 04$a551.7 GRE =100 1\$aGregory, K. H. =245 10$aInterpretations of striae and roches moutonnees in central Snowdonia, North Wales =260 \\$bCity of London Polytechnic,$c1986 =650 \0$aPamphlets =852 \\$bFreeman Library$h551.7 GRE$zNot located