Columbia subject headings:
Gask Ridge (Scotland)--Antiquities, Roman.
Romans--Scotland--Gask Ridge.
Harvard subject headings:
Excavations (Archaeology)--Scotland--Perth and Kinross.
Fortification, Roman--Scotland--Perth and Kinross.
Gask Ridge (Scotland)--Antiquities, Roman.
Perth and Kinross (Scotland)--Antiquities, Roman.
Romans--Scotland--Perth and Kinross.
Princeton subject headings:
Gask Ridge (Scotland)--Antiquities, Roman.
Romans--Scotland--Gask Ridge.