Columbia subject headings:
Harvard subject headings:
Aerial photography in archaeology--England.
Aerial photography in archaeology--Wales.
England--Antiquities--Remote sensing.
England--Antiquities.
Photography in archaeology--England.
Photography in archaeology--Wales.
Wales--Antiquities--Remote sensing.
Wales--Antiquities.
Princeton subject headings:
Aerial photography in archaeology--England.
Aerial photography in archaeology--Wales.
England--Antiquities--Remote sensing.
Wales--Antiquities--Remote sensing.