Columbia subject headings:
Harvard subject headings:
Fortification--Macedonia--Skopje Region.
Fortification--North Macedonia--Skopje Region.
Military history, Ancient.
Military history, Medieval.
North Macedonia--Antiquities
Skopje Region (Macedonia)--Antiquities.
Princeton subject headings:
Fortification--Macedonia (Republic)--Skopje Region.
Macedonia (Republic)--Antiquities.
Skopje Region (Macedonia)--Antiquities.