=LDR 22 4500 =001 4010 =082 04$a526 HAR =100 1\$aHarley, J. B. =245 10$aOrdnance survey maps: a descriptive manual =260 \\$bSouthampton Ordnance Survey,$c1975 =650 \0$aBooks =852 \\$bFreeman Library$h526 HAR