Exton Quarries, Inc. v. Zoning Board of Adjustment , 425 Pa. 43 ( 1967 )
O'NEILL v. Zoning Bd. of Adj. , 434 Pa. 331 ( 1969 )
Spahr-Alder Group v. Zoning Board of Adjustment , 135 Pa. Commw. 561 ( 1990 )