Books About the Willie and Martin Handcart Companies

I just wrote a very long post for my personal blog listing 4 different books about the Willie and Martin handcart companies. I was going to write a separate post for this blog but to save time - just check my blog if you are interested. Here is the link to the post:
http://almosthalfwaythere.blogspot.com/2009/06/price-they-paid.html