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http://digital.library.pitt.edu/pittsburgh/
A digital library collection containing full-text books, maps, census information, chronology, and archival finding aids, all related to the history of the Pittsburgh region.
http://buhlplanetarium.tripod.com/
Information on the equipment and facilities.
http://www.phlf.org/
A non-profit historic preservation group serving Allegheny County. It is dedicated to identifying and preserving the architectural landmarks, historic neighborhoods, and historic designed landscapes of Allegheny County and educating people about this regions architectural heritage and urban landscape design history.
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