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Website has a section for five historic maps of London including the fire, two surveys of London and surrounding areas and a topographic dictionary for England, Scotland and Wales. Another section has selected ordinance surveys.
The University of Bern historic map collection has "more than 16,000 maps, charts, plans and views from the 16th to the 18th century, covering the whole globe."
Large online collection of 25,000 maps worldwide, both current and historical. Of special note are some CIA historical maps not available elsewhere online.