=LDR 22 4500 =001 4174 =082 04$a551.38 WAS =100 1\$aWashburn, A. L. =245 10$aPeriglacial Processes and Environments =260 \\$aLondon :$bEdward Arnold,$c1973 =650 \0$aBooks =852 \\$bFreeman Library$h551.38 WAS