File talk:OldDutcharea.png

Source?

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...

Kleon3 (留言) 15:27, 6 January 2023 (UTC)