I don't know why Indian nationalists take a root at pontic Caspian steppes as an attack against antiquity of our culture. It doesn't take anything away from us. They were not Europeans or something. They didn't attack and invade the indigenous mostly mixed with them. Before them there were migrations from zagros mountains etc..
> Central Asia/European roots.
They are not the same.
> But really what kind of evidence do we have for the existence of a sophisticated culture in Germany that predates Harappa.
You clearly have not read the book. It's not Germany, it's Pontic Caspian steppes, approximately in modern day Ukraine if I recall correctly.