Standard & Poor's Ratings Services' 'AA' rating on Maricopa County Community College District, Ariz.'s revenue bonds reflects: The broad economic and tax base of Maricopa County and the strong GO rating of the district's debt; Very low revenue-bond debt ($29 million), The large and growing enrollment base of the district's 10 colleges and two skill centers (nearly 300,000); and Balanced financial operations and good liquidity ratios. The bonds are secured by a pledge of gross revenues. Gross revenues include all tuition, fees, rentals, and other student charges. Bond proceeds will be used to construct a performing arts center at the Paradise Valley Community College campus and other improvements. The stable outlook reflects the anticipation of continued balanced financial operations, healthy