About the Bugeac image

Ok sorry to answer so late. The map was originally created  by Anonimu and he based his map exclusively on the Soviet census of 1989 if I am correct. He did not post it on the article, he just suggested it as a possible map, however everyone sort of ignored it. I contacted him and inquired about it. I took the map and changed it in areas where i knew for sure from census data from 2001 that there were mistakes. Besides the census, the sources I used were  and  as well as this site for the actual map .