NY -- Standard & Poor's CreditWire 4/30/98 -- Standard & Poor's today placed its ratings on six Mellon Bank N.A. LOC-backed municipal issues on CreditWatch with positive implications. This follows the April 23, 1998 placement of Mellon Bank N.A. on CreditWatch with positive implications. -- CreditWire Issuer Rating Allegheny Cnty Hosp Dev Auth $14.7 mil (St Margaret Mem Hosp Of Pittsburgh) A+/A-1 Cumberland Cnty Mun Auth $27.8 mil (Dickinson Coll) var rate rev bnds (Dickinson Coll) ser 1996A&B AA/A-1 Dearborn Econ Dev Corp. $15.8 mil (Oakbrook Comm Proj) var rate tax-exempt ltd oblig ser 93 A+/A-1 Fairfax Cnty Econ Dev Auth $15 mil rev (American Civil Engineers Fndn) ser 95 A+/A-1 Pennsylvania Hgr Ed Fac Auth $16 mil adj rate
