There is a new book recently published by Clarence Earnhart outlining the Earnhart/Earnhardt family. It is the best work of this kind of have ever seen. Clarence has definitely put in a lot of hard work into this. I would highly recommend it.
You can purchase the book directly from Clarence Earnhart at 15342 Country Ridge Drive, Chesterfield MO 63017 or email him at firstname.lastname@example.org. The book cost $26.