The basic search locations for Vital Records are...
Family Search
and
The Western Pennsylvania Genealogical Society.
Delayed Birth Records: Filed: 1941-1976: FS
Use the chart below to locate Delayed Birth Records for folks born in Westmoreland County:
These are actual birth records and petition Images
Log into your FS Account, Search, Catalog
and plug in the film number of interest
Poulson's marriages and deaths 1791-1839 and 1791-1799