"As Acting Deputy Director I hereby designate the attached decision of the Administrative Appeals Office (AAO) in Matter of Buschini as a USCIS Adopted Decision. Accordingly, this decision is binding policy guidance on all USCIS personnel. This AAO decision provides guidance regarding the type of documentation that must be submitted in order to establish Cuban citizenship for purposes of adjustment of status under section 1 of Pub. L. 89-732 (November 2, 1966) as amended (Cuban Adjustment Act). Applicants are required to provide official documentation from the Cuban Government indicating that he or she is a citizen of Cuba. Documents lacking a specific notation that the applicant is a citizen will not ordinarily be accepted as proof of Cuban Citizenship. USCIS personnel are directed to follow the reasoning in this decision in similar cases."
U.S. Citizenship and Immigration Services: http://www.uscis.gov/