NY -- Standard&Poor's CreditWire 7/15/97 -- Standard&Poor's today has affirmed its double-`B'-plus foreign currency rating on Banco de Galicia y Buenos Aires S.A., following the announcement of its planned acquisition of an additional 50% stake in Banco Sudecor Litoral S.A., Cordoba, Argentina. Banco de Galicia will subscribe shares of the regional bank, paying US$30 million or roughly book value, increasing its stake from the 49% acquired last year to 99.15% of the shares and 100% of the voting rights. Banco Sudecor Litoral has Arg$372 million of total assets at March 31, 1997 and operates through 64 branches with concentration in the provinces of Cordoba and Santa Fe. With Arg$249 million of deposits at March 31, 1997,