Citicorp's joint marketing program with Ford Motor Co. helped put the nation's No. 1 banking company back on the credit card growth track in the first half, according to data compiled by RAM Research Corp.

Already the largest credit card issuer by a wide margin, Citicorp increased its card-loan portfolio by 1.41% in the six months, to $36 billion, according to the Frederick, Md., research firm.

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