Degener

Hello, I am researching my wife's side of the family. They are Degener and settled in Randolph County, Illinois. First around Red Bud, current family living in Sparta. I would love connections with anyone with information related. I am particularly interested in the book mentioned in this list "Degeners Nopke #21 1674 - 1984" written by Verna Drake. Is this a connection with my Degeners and if so how do I find a copy? Thanks for any help.
Nate