Map of <a href="https://en.wikipedia.org/wiki/Human_hair_color" class="extiw" title="en:Human hair color">hair</a> and <a href="https://en.wikipedia.org/wiki/Eye_color" class="extiw" title="en:Eye color">eye pigmentation</a> in Europe.
Drawing by Elmer Rising in a book published by <a href="https://en.wikipedia.org/wiki/Carleton_S._Coon" class="extiw" title="w:Carleton S. Coon">Carleton S. Coon</a>.
1939
<cite class="book" style="font-style:normal">"<a rel="nofollow" class="external text" href="https://archive.org/stream/in.ernet.dli.2015.222580/2015.222580.The-Races#page/n281">Pigmentation of Hair and Eyes</a>" in   (1939) <i> <a href="https://en.wikipedia.org/wiki/The_Races_of_Europe_(Coon)" class="extiw" title="w:The Races of Europe (Coon)">The Races of Europe</a></i>, New York, United States:  Macmillan, p. 270  <small><a href="https://en.wikipedia.org/wiki/Online_Computer_Library_Center" class="extiw" title="en:Online Computer Library Center">OCLC</a>:   <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/575541610">575541610</a>. </small></cite>.