I recommend: Human Diversity: by Charles Murray.
It does much to show how biological differences in four-seven human ancestral population groups have been found to be significant.
They roughly correspond to African, East Asian, European, North and South American (much in common with East Asian), the Middle East, Central Asia, and Oceania.
I have read some of Murray’s writings. It seems compelling. The elites are willing to believe Africans can be better in some characteristics but never worse. Same with females. They can only be better. They shout down any studies to the contrary or say it is due to other factors.