File talk:OldDutcharea.png
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Source?
[编辑]What is the source for the linguistic information in this map? How trustworthy is this information? What period are we talking about? Who is/was the author Rex Germanus~commonswiki (inactive since 2006/2007)?
Meanwhile, some 30 Wikipedia pages present this map, of which we know nothing of its origin, as a God-given truth...