=LDR 22 4500 =001 3543 =082 04$a526.88 DUR =100 1\$aDury, G. H. =245 10$aMap Interpretation =260 \\$aLondon :$bPitman and Sons,$c1952 =650 \0$aBooks =852 \\$bFreeman Library$h526.88 DUR