Over on Quora I put together some very good sources all in one place, most of these are from field studies with raw data, so expect very dry reading with lots of scientific jargon, but don't be intimated it's rewarding, others are seen through the lens of historians, I'll do more cross posting here and there the link is on the bottom, administered by yours truly. A few examples. link.springer.com/article/10.1007/s10437-018-9314-2 On the Origins and Dissemination of Domesticated Sorghum and Pearl Millet across Africa and into India: a View from the Butana Group of the Far Eastern Sahel
The Gaijanna Zilum Complex.
Interesting for startup research.
The Development of Ancient States in the Northern Horn of Africa, c. 3000 BC–AD 1000: An Archaeological Outline