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Those are the studies I was able to find.
Northwestern Czechs (old study):
Another study on hair color (also old):
From a bit newer study (sometime between 1949 and 1960 given the administrative divisions), average hair and eye colors by region:
If anyone knows the source for this, please let me know.
Maps I made based on the data above:
If anyone has any others I would really appreciate if you post them here. Thank you.
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