http://www.white-history.com/refuting_rm/pcs.html

Table of Contents
- Introduction
- Cavalli-Sforza's initial interpretations of the PCs
- What was wrong with Cavalli-Sforza's initial interpretations?
- PC1 -- First principal component of genetic variation in Europe
- PC2 -- Second principal component
- PC3 -- Third principal component
- Addendum
- Sources
- Additional reading

http://www.white-history.com/refuting_rm/pcs.html