Philadelphia (Pa.)--Social conditions--20th century Mayors--Pennsylvania--Philadelphia 2 Philadelphia (Pa.)--History--20th century 2 Philadelphia (Pa.)--Officials and employees 2 Campaign management--United States 1 Elections--Pennsylvania--Philadelphia--History--20th century 1 Elections--United States--Planning 1 more ... Engineering firms--United States 1 Engineering proceedings 1 Engineering--Education 1 Engineering--Pennsylvania 1 Engineering--Pennsylvania--Philadelphia 1 Engineering--Problems, exercises, etc 1 Engineering--Social aspects--United States 1 Engineering--Societies, etc 1 Municipal government--Pennsylvania--Philadelphia--20th century 1 Municipal officials and employees--Pennsylvania--Philadelphia 1 Municipal records--Philadelphia 1 Philadelphia (Pa.)--City government--20th century 1 Philadelphia (Pa.)--Politics and government--20th century 1 Philadelphia (Pa.)--Social problems 1 Political campaigns--Law and legislation--United States 1 Political campaigns--Pennsylvania 1 less ...