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Directory of Pittsburgh and Allegheny Cities, the Adjacent Boroughs, Also Parts of the Adjacent Townships

出版	Geo. H. Thurston., 1868
URL	http://books.google.com.hk/books?id=vwYuAAAAYAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋1868/69, 1870/71 include a business directory.