<p>A picture from a book by Czech archaeologist <a href="https://en.wikipedia.org/wiki/Lubor_Niederle" class="extiw" title="en:Lubor Niederle">en:Lubor Niederle</a> "Slavic Antiquities" (Slovanské starožitnosti), series published between 1902-24. The name can be translated as "Ethnographical map of Slavs". <br> Textual description for the colors says:
</p>
<ul><li>all green - <a href="https://en.wikipedia.org/wiki/Rus_(name)" class="extiw" title="en:Rus (name)">People of Rus</a></li>
<li>lightest green - <a href="https://en.wikipedia.org/wiki/Great_Russians" class="extiw" title="en:Great Russians">Great Russians</a> (<a href="https://en.wikipedia.org/wiki/Russians" class="extiw" title="en:Russians">Russians</a>)</li>
<li>green - <a href="https://en.wikipedia.org/wiki/White_Russia" class="extiw" title="en:White Russia">White russians</a> (<a href="https://en.wikipedia.org/wiki/Belarusians" class="extiw" title="en:Belarusians">Belarusians</a>)</li>
<li>dark green - <a href="https://en.wikipedia.org/wiki/Little_Russia" class="extiw" title="en:Little Russia">Little Russians</a> (<a href="https://en.wikipedia.org/wiki/Ukrainians" class="extiw" title="en:Ukrainians">Ukrainians</a>)</li>
<li>yellow - <a href="https://en.wikipedia.org/wiki/Poles" class="extiw" title="en:Poles">Poles</a> and <a href="https://en.wikipedia.org/wiki/Kashubians" class="extiw" title="en:Kashubians">Kashubians</a></li>
<li>orange - <a href="https://en.wikipedia.org/wiki/Sorbians" class="extiw" title="en:Sorbians">Lusatian Serbs</a></li>
<li>light orange - <a href="https://en.wikipedia.org/wiki/Czechs" class="extiw" title="en:Czechs">Czechs</a> and <a href="https://en.wikipedia.org/wiki/Slovaks" class="extiw" title="en:Slovaks">Slovaks</a></li>
<li>pink - <a href="https://en.wikipedia.org/wiki/Slovenians" class="extiw" title="en:Slovenians">Slovenians</a></li>
<li>brown - <a href="https://en.wikipedia.org/wiki/Serbo-Croatian" class="extiw" title="en:Serbo-Croatian">Serbo-Croatians</a></li>
<li>blue - <a href="https://en.wikipedia.org/wiki/Bulgarians" class="extiw" title="en:Bulgarians">Bulgarians</a></li></ul>
Uploaded to Wikipedia on 17:50, July 7, 2006 by <a href="https://en.wikipedia.org/wiki/User:Pavel_Vozenilek" class="extiw" title="w:User:Pavel Vozenilek">w:User:Pavel Vozenilek</a>
Published 1902-24
Uploaded picture was found in online version of a review about Czech nation between 1899-1914, chapter 5 at <a rel="nofollow" class="external autonumber" href="http://www.narmyslenka.cz/ceskarevue/REVUE5.PDF">[1]</a> (PDF file, all texts in Czech). They have it scanned from the book. The image quality is not the greatest.