I read this book not so long ago and wanted to bring it to the attention of anyone who may be interested. The authors (Ayana D.Byrd and Lori L.Tharps) annoyed me, at times, but I enjoyed most of the first and third chapters.

http://www.amazon.com/Hair-Story-Untangling-Roots-America/dp/0312265999

You can read some of it on Amazon, if you'd like.