回复:Xiaobaitu, Pjiang 老师及各位大侠:关于I-551章。

Since you have I-551 stamp on passport, you are considered as PR. You may use stamped passport to get admission, and you may work without additional authorization.

You can't apply AP/EAD.
http://blog.wenxuecity.com/blogview.php?date=200709&postID=3149

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