2
This is the only thing I was able to find. It's form sometime between 1949 and 1960 given the administrative divisions, first column average eye color (higher is lighter), the second average hair color (higher also lighter) by region in Czechoslovakia:
If anyone knows the source for this, please let me know.
Maps I made based on the data above:
The most prominent study on Slovakia alone was done by Zdeněk Frankenberger called "Antropologické studie ze slovenska, 1936"
Unfortunately it doesn't seem to be anywhere online in the digital form. If anyone has it please let me know.
Bookmarks