Personally I don’t consider this man books to be a good anthropological sources, but even if its good to have alternative opinions (even when are completly rubish and nonsense – like within Coon’s books). I give to you varienty sources of his books, take it easy and dont take it to seriously (after all look at date and compare to modern technics and results).
Caravan The Story Of Middle East (1951):
The Races Of Europe (1939):
The Origin of Races (1962):