Labor relations--Pennsylvania--20th century 2 Coal mines and mining--Pennsylvania 1 Labor disputes--Pennsylvania--Hazelton 1 Labor movement--Pennsylvania--Philadelphia 1 Labor relations--Pennsylvania--19th century 1 Labor--20th Century 1 Real Estate--Pennyslvania--20th century 1 more ... School lunchrooms, cafeterias, etc.--Management 1 School lunchrooms, cafeterias, etc.--Management--Contracting out 1 School lunchrooms, cafeterias, etc.--Management--Contracting out--United States 1 School lunchrooms, cafeterias, etc.--Pennsylvania--Philadelphia--Management 1 School lunchrooms, cafeterias, etc.--United States--Management 1 less ...