Columbia subject headings:
Harvard subject headings:
Antiquities
Antiquities--Collection and preservation
Antiquities--Pictorial works.
Civilization--Pictorial works.
Conservation of natural resources.
Cultural property--Protection
Excavations (Archaeology)--Pictorial works.
Historic sites
Historic sites--Conservation and restoration
Historic sites--Pictorial works.
Natural areas.
Princeton subject headings:
Antiquities--Pictorial works.
Antiquities.
Cultural property--Protection.
Historic sites--Pictorial works.
Historic sites.