Columbia subject headings:
Harvard subject headings:
Archaeology and history--Maine--Lincoln County.
Fort Frederick (Me.)
Lincoln County (Me.)--Antiquities.
Lincoln County (Me.)--History.
Maine--Antiquities.
Princeton subject headings:
Excavations (Archaeology)--Maine--Pemaquid.
Fortification--Maine--Pemaquid.
Pemaquid (Me.)--Antiquities.
Pemaquid (Me.)--History.