copies of extension approval letter

amdomd

Registered Users (C)
I had extended my B-1 visa in 1998 twice through Vermont Service Center. Currently my case is being handled at Nebraska Service Center for adjustment to permanent resident. I need copies of those extension approvals coz I don't have them. Do I have to fill out 2 seperate I-824 forms for each extension approval letter? Do I apply to Vermont or Nebraska? How long does it take to get such copies??
 
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