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Thanks to everyone who responded.

15 said Bush's

3 said Amy's

1 said Heinz

1 said British Heinz, are vegan and GF and may be found in the international
section of most grocery stores.

I was happy to find out that Bush's are indeed GF.  We had stopped using
them 6-8 months ago, after I read some out-dated material about possible
cross-contamination.  They are very tasty.   The company has a website,
bushbeans.com.  Click on Products, Baked Beans, Product Q&A, and you will
see that the very top question is "Are any of your baked beans Gluten-Free?
 Which ones?"

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