Columbia subject headings:
Architecture--England--Oxford--History.
Building trades--England--Oxford.
Building--England--Oxford--History.
Construction workers--England--Oxford.
Knowles & Son.
Knowles family.
Harvard subject headings:
Architecture--England--Oxford--History.
Building trades--England--Oxford.
Building--England--Oxford.
Building--History--England--Oxford.
Construction industry--England--Oxford.
Construction workers--England--Oxford.
Knowles & Son.
Knowles family.
Princeton subject headings:
Architecture--England--Oxford--History.
Building trades--England--Oxford--History.
Building--England--Oxford--History.
Construction workers--England--Oxford--History.
Knowles & Son.
Knowles family.