150000 Historical Maps. Enhanced reproductions of four historical Ordnance Survey maps of London from 1805 to 1946 enlarged and re-projected to match present-day 1:50,000 scales and combined to cover the whole city, , as a set of four rolled maps in a tube. Regular publicity in a wide range of national, local ans specialist newspapers and magazines. The publishers have on several occasions helped arrange local publicity linked to a specifiec retailer.