Please try http://digital.library.pitt.edu/pittsburgh/
& site map & full text search
Try search on business name.
Also many townships/boroughs have their own history/gene bookshttp://www.wpgs.org/http://freepages.genealogy.rootsweb.com/~njm1/tombs
"Pittsburgh Post- Gazette, Tues., Nov. 9, 2004 Obits is Erny William F., age 78...husband of Norma (Perhacs)...father...grandfather...WWII...John F. Slater Funeral Home....St. Wendelin Church...please sign (view) the guest book at post-gazette.com"