Columbia subject headings:
Excavations (Archaeology)--England--Somerset Levels.
Harvard subject headings:
Bronze age--England--Somerset Levels.
Bronze age--England--Somerset.
Dendrochronology--England--Somerset Levels.
Dendrochronology--England--Somerset.
Excavations (Archaeology)--England--Somerset Levels.
Leys--England--Somerset.
Neolithic period--England--Somerset Levels.
Neolithic period--England--Somerset.
Roads, Prehistoric--England--Somerset Levels.
Somerset (England)--Antiquities.
Princeton subject headings:
Archaeological dating--England--Somerset.
Dendrochronology--England--Somerset.
England--Antiquities.
Excavations (Archaeology)--England--Somerset.
Roads, Prehistoric--England--Somerset.
Somerset (England)--Antiquities.
Tree-rings.