Columbia subject headings:
Buildings--Pennsylvania--Philadelphia.
Historic buildings--Pennsylvania--Philadelphia--Guidebooks.
Medicine--Pennsylvania--Philadelphia--History.
Harvard subject headings:
Historic buildings--Pennsylvania--Philadelphia--Guidebooks.
Medicine--Pennsylvania--Philadelphia--History.
Philadelphia (Pa.)--Buildings, structures, etc.--Guidebooks.
Philadelphia (Pa.)--Guidebooks
Princeton subject headings:
Guidebooks.
Historic buildings--Pennsylvania--Philadelphia--Guidebooks.
Medicine--Pennsylvania--Philadelphia--History.
Philadelphia (Pa.)--Buildings, structures, etc.--Guidebooks.
Philadelphia (Pa.)--Guidebooks.