Weber v. Philadelphia , 437 Pa. 179 ( 1970 )
R. S. Noonan, Inc. v. York School District , 400 Pa. 391 ( 1960 )
ethyl-corporation-v-environmental-protection-agency-ppg-industries-inc , 541 F.2d 1 ( 1976 )
Nielson v. Womer , 46 Pa. Commw. 283 ( 1979 )
Lasday v. Allegheny County , 499 Pa. 434 ( 1982 )