[Fedora]

Thanks for the links. I've seen some other interesting work on Chinese-Olmec links by the scholar mentioned in that first link, Mike Xu. The main source of information on the Shang dynasty is the Shu ching (aka Shu king, etc.; also Shang shu) or Book of Documents (aka Classic of History, Book of Historical Documents, Documents of Antiquity):

Shu King, the Book of Historical Documents

Unfortunately the first Emperor of the Ch'in Dynasty, Shih Huang Ti, destroyed most copies of the Shu ching, and the copies we have now are based on fragments recovered by Han Dynasty historians and mixed with forgeries, so I think it's difficult to say much with confidence about the Shang Dynasty, apart from archaeological data. I do think the evidence for Chinese-Olmec links is significant, though.

[blam]

"I do think the evidence for Chinese-Olmec links is significant, though."

Yup, more than just 'smoke', there's fire in there some where.

You are extremely good a searches. Do us a favor and see if you can find pictures of some Hakka Chinese. Thanks.