Columbia subject headings:
Harvard subject headings:
Architecture, Modern--20th century--England--London.
Ark (London, England)
Erskine, Ralph, d 1914-
London (England)--Buildings, structures, etc.
Office buildings--England--London--Designs and plans.
Princeton subject headings:
Ark (London, England).
Erskine, Ralph, 1914-2005.
London (England)--Buildings, structures, etc.