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Visa to attend conference

PostPosted: Sun Jun 14, 2009 2:22 am
by Aisha
Hello everyone,

I have registered for a conference in the USA due to be held this August. I have obtained an invitation letter from the organizers. My question is that since I already have a valid H4 visa, do I need to obtain a separate visa to attend the conference?
Thanks for taking your time to read my query.