US consulate or embassy, you don't need visa again. If you got it from US-Canada border, you still need visa stamp from China. Because USCIS and State Department are different system. Visa is issued by US consulate/ embassy under State Department and used for entry US. USCIS is responsible the immigration status, i.e. whether you are with legal status, only valid in US. I don't know what kind of stamp you have, seems not a visa stamp.
回複:If you got this "Stamp"
                回答: you need to bring your H1/H4 documents to US consulate in China
                由 pharmacyelite
                於 2007-10-15 20:43:31
            
            
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                    回複:回複:If you got this "Stamp"
                     -YiBei- 
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                        10/15/2007 postreply
                                                22:05:51