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I thought I had run across a thread with book recommendations on here recently, but can't find it. Biggest interest right now is cajun and german type sausages.
The books by the Marianski's and Rytek Kutas are the standards for education & reference. Burce Aidells' complete sausage book is worth a look as is one by Michael Ruhlman. The gang will be along shortly to add to the list.