Archaeology magazine has a long article about the huge mass of artifacts uncovered while building, PPG Place, PNC Park, and Three PNC Plaza all of which give a much better picture of the city in the 19th Century. Possessions of prominent citizens like General William J. Robinson, The first mayor of Allegheny City and his wife as well as many of it's poor, middle and working class have been found. Remember, Downtown was in the early days very densely populated.
Both, PNC Park and The New Fairmont Hotel in Pittsburgh prominently display the historic artifacts found during their construction.
A real must read--with a big copyright mark on it-so I'm not making direct quotes.
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