TY - BOOK AU - Gallaher,John T. ED - Geological Survey (U.S.). TI - Summary, ground-water resources of Allegheny County,: Pennsylvania T2 - Pennsylvania PY - 1973/// CY - Harrisburg PB - [Topographic and Geologic Survey] KW - Water, Underground KW - Pennsylvania KW - Allegheny County N1 - "Prepared by the U. S. Geological Survey, Water Resources Division, in cooperation with the Pennsylvania Geological Survey."; Spine title: Ground-water resources of Allegheny Co ER -