Fortunately, the great state of Pennsylvania has made PLRB Final Orders available online (here). There's a search box and everything! It looks like coverage goes back to 1999. They also have Forms, Proposed Orders, Fact-Finding Reports, and other publications. I have found this useful in researching PA labor issues and thought I'd pass it along. Enjoy!
Image: Pennsylvania Department of Labor and Industry logo used in commentary on PA DLI - NOT OFFICIAL USE.