=LDR 22 4500 =001 1197 =082 04$a551.79 SKE =100 1\$aSkempton, A. W. =245 10$aA discussion on valley slopes and cliffs in southern England: morphology, mechanics and Quaternary history =260 \\$aLondon :$bRoyal Society,$c1976 =650 \0$aPamphlets =700 1\$aHutchinson, J. N. =852 \\$bFreeman Library$h551.79 SKE