Hi all -
They were all owned, eventually, by Errett Lobban Cord and there is
great museum (not visited yet) for all in Auburn Indiana. I think
grouping the books together is appropriate.
http://en.wikipedia.org/wiki/Errett_Lobban_Cord
Trivia - Long ago, I went to a Dusenberg "seminar" conducted by this
marque's expert, Randy Ema. He mentioned that he purchased all the
assets of the Dusenberg company and the personal assets of Fred &
Augie Dusenberg. Also owns the rights to the Dusenberg name!
Bob