Columbia subject headings:
Derbyshire (England)--Antiquities.
England--Antiquities.
Excavations (Archaeology)--England--Derbyshire.
Harvard subject headings:
Derbyshire (England)--Antiquities.
England--Antiquities.
Excavations (Archaeology)--England--Derbyshire.
Princeton subject headings:
Derbyshire (England)--Antiquities.
Excavations (Archaeology)--England--Derbyshire.
Peak District National Park (England)--Antiquities.
Walls--England--Derbyshire.