Columbia subject headings:
Harvard subject headings:
Avon Valley (Leicestershire-Gloucestershire, England)--Economic conditions.
Avon, River (Leicestershire-Gloucestershire, England)--Channelization--History.
Avon, River (Leicestershire-Gloucestershire, England)--History.
Canals--England--Avon--History.
Canals--England--Gloucestershire--History.
Canals--England--Leicestershire--History.
Princeton subject headings:
Avon Valley (Leicestershire-Gloucestershire, England)--Economic conditions.
Avon, River (Leicestershire-Gloucestershire, England)--Channelization--History.
Avon, River (Leicestershire-Gloucestershire, England)--History.
Canals--England--Avon--History.
Canals--England--Gloucestershire--History.
Canals--England--Leicestershire--History.