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I think that as well as the actual map having a copyright (which has lapsed for old maps so are in the public domain) there is the issue of the database that you use to get a copy of the map on the screen being the intellectual property of the website owners - the terms of use forbid use for commercial gain of any information provided on the website - because you are using the website architecture and database to access the public domain map you are using the website owner's intellectual property.