Dave Mitchell

Automobile Quarterly devoted an entire issue to Duesenberg a couple of years ago, and this combined with the Roe and Elbert books should give you a good history. The Elbert book has been reprinted and may be available through Classic Motorbooks or ordered at a book store. You might also contact the Auburn Cord Duesenberg Museum in Auburn, Indiana, they not only have a research center, but also a gift shop that sells books.