APS/URSI 2014 offers two different kinds of official letters. For accepted authors who have not yet registered, but need an official document proving the status of the paper, there is the Official Acceptance Letter. After registration becomes available online, persons who have registered and paid the complete registration fee may request an Official Invitation Letter, which shows proof of registration.
Official Acceptance Letter: Click Here to request an official acceptance letter. This is available only to authors of accepted APS/URSI 2014 papers.
Official Invitation Letter: Not available yet. This is available only to persons who have completed registration and payment to APS/URSI 2014.
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As of January 12, 2009, a valid ESTA approval is require for all Visa Waiver Program (VWP) travel to the United States. Click here for additional information.