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I'd like to know which product guides people feel are the best/most helpful.  I have an aquaintance who is having many, many celiac symptoms, but has received negative test results.  I would like to purchase a guide for her and for my celiac son.  In the past, I have used the Tri-County Celiac Sprue Shopping Guide and like it very much.  I thought I would investigate others. 
Thank you
Nancy Haehl
Indiana   

*Please provide references to back up claims of a product being GF or not GF*