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1. No. They are not US edition. They are 3rd edition. However, the differences are minor. They just wouldn't have the US measurements and money, and a few of the more Asian names and such in the story problems have been Americanized. Otherwise, they are the same.
2. I think I only listed 2 workbooks, and yes, they are clean. The workbooks are brand-new. Never written in. The others are non-consumable "textbooks" and have also not been written in.