Other
Local transit--Pennsylvania--Philadelphia
Transportation
2
Advertising, Outdoor--United States--History--20th century
1
Floods--Pennsylvania--Johnstown (Cambria County)
1
Law offices--Records and correspondence
1
Local transit--Economic aspects--Pennsylvania--Philadelphia
1
Local transit--Pennsylvania--Philadelphia--History--20th century
1
Philadelphia Rapid Transit Company
1
Philadelphia Rapid Transit Company--History and criticism
1
Photograph albums
1
Photograph albums--1930-1950
1
Photographers--Pennsylvania--Philadelphia
1
Railroads
1
Railroads, Elevated--Pennsylvania--Philadelphia
1
Railroads--Management
1
Subways--Pennsylvania--Philadelphia
1
Transportation--Pennsylvania--20th century
1
Transportation--Pennsylvania--Philadelphia--History
1
Transportation--Pennsylvania--Philadelphia--History—20th century
1
Work environment—Pennsylvania—Philadelphia—History—20th century
1