Work environment—Pennsylvania—Philadelphia—History—20th century 2 Advertising, Outdoor--United States--History--20th century 1 Diaries--20th century 1 Floods--Pennsylvania--Johnstown (Cambria County) 1 Local transit--Pennsylvania--Philadelphia 1 Local transit--Pennsylvania--Philadelphia--History--20th century 1 Photograph albums 1 more ... Photograph albums--1930-1950 1 Photographers--Pennsylvania--Philadelphia 1 Social life and customs--Philadelphia (Pa.)--20th century 1 Transportation--Pennsylvania--Philadelphia--History 1 Transportation--Pennsylvania--Philadelphia--History—20th century 1 Women--Pennsylvania--Philadelphia--Social conditions 1 Women--Pennsylvania--Philadelphia--Social life and customs 1 Women--Social life and customs--20th century 1 less ...