Columbia subject headings:
Architecture and history--Congresses.
Architecture--England--London--Congresses.
Architecture--England--Oxford--Congresses.
City planning--England--London--Congresses.
City planning--England--Oxford--Congresses.
Historic districts--England--London--Congresses.
Historic districts--England--Oxford--Congresses.
Magdalen College (University of Oxford)--Buildings--Congresses.
Harvard subject headings:
Architecture and history--Congresses.
Architecture--England--London--Congresses.
Architecture--England--Oxford--Congresses.
City planning--England--London--Congresses.
City planning--England--Oxford--Congresses.
Historic districts--England--London--Congresses.
Historic districts--England--Oxford--Congresses.
Magdalen College (University of Oxford)--Buildings--Congresses.
Princeton subject headings: