found: Its Borough Engineers. Plan of West Mifflin Borough, Allegheny County, Pennsylvania, 1980:map recto (West Mifflin Borough, Allegheny Co.)
found: LC data base, 12-13-83(hdg.: West Mifflin)
found: Rand McNally comm. atlas, 1982(West Mifflin, in Allegheny Co.; inc.)
found: History of Mifflin township to West Mifflin borough, 1976 :p. 7 (Mifflin Township; one of 7 original townships formed from Allegheny County; Act 333 of 1941 enabled Mifflin township to incorporate as a borough; it was the first time an entire township could become a borough; Mifflin towship in Allegheny County ceased to exist as of Jan. 3, 1944)
found: GeoNames, algorithmically matched, 2009(ppl; 40°21ʹ48ʺN 079°51ʹ59ʺW)