What it says on the tin.
I'm interested in anything that gives a sense of when Chinese languages and culture, started in the Hwang Ho/Yellow River valley, became predominant in various regions to the south, like the Yangzi valley, Sichuan, Guangdong, Hainan etc. Additionally, anything on the level of agricultural, metallurgy or writing (if it exists) of the pre-Han cultures would be of interest. I'd like to use it get a sense of the timeframe and "rate of advance" of the Han Chinese culture to the borders of Southeast Asia.