=LDR 22 4500 =001 4009 =082 04$a526 OLI =100 1\$aOliver, Richard =245 10$aOrdnance survey maps: a concise guide for historians =260 \\$aLondon :$bthe Charles Close Society,$c1993 =650 \0$aReserve =852 \\$bFreeman Library$h526 OLI