Philadelphia--Built Environment--Images 8 Built environment--Pennsylvania--Philadelphia--20th century 6 Philadelphia--Built Environment 3 Architecture--Philadelphia--20th Century 2 Built Environment--Philadelphia--18th century 2 Built Environment--Philadelphia--19th century 2 Panoramas--19th century 2 more ... Philadelphia Views--20th century 2 Philadelphia--Streets--Arch St 2 Philadelphia--Streets--Chestnut St 2 Philadelphia--Streets--Market St 2 Advocacy organizations--Philadelphia--20th century 1 Affirmative action programs--Government policy--United States--History--20th century 1 Architectural Plans--Philadelphia--20th century 1 Architecture--Germantown (Pa)--19th century 1 Architecture--Pennsylvania--20th century 1 Architecture--Philadelphia--18th century 1 Architecture--Philadelphia--19th century 1 Bank of Pennsylvania--Philadelphia--18th century 1 Built Enviroment--Philadelphia--19th century 1 Built Environment--Germantown (Pa)--19th century 1 Built Environment--Main Line (PA)--20th century 1 Business and manufacturing--Pennsylvania--Philadelphia--20th century 1 Business mergers and acquisitions--20th century 1 Business--History--Pennsylvania--Philadelphia--20th century 1 Centre Square Water Works--Philadelphia--18th century 1 City planning and development--Pennsylvania--Philadelphia--20th century 1 City planning--Pennsylvania--Philadelphia--20th century 1 Commerce--Philadelphia--19th century 1 Consumer activism--20th century 1 Delaware River--Views 1 Demolished Buildings--Pennsylvania--Philadelphia--20th century 1 Graphics, prints--Reproductions 1 Historic Landmarks--Germantown (Pa)--19th century 1 Insurance, Fire--Pennsylvania--19th century 1 Insurance, Fire--Pennsylvania--20th century 1 Internal Improvements--18th century 1 Internal Improvements--19th century 1 Lantern Slides 1 Lawyers--Pennsylvania--Philadelphia--20th century 1 less ...