Columbia subject headings:
Biga Peninsula (Turkey)--Description and travel--Congresses.
Geology--Turkey--Biga Peninsula--Congresses.
Harvard subject headings:
Biga Peninsula (Turkey)--Description and travel--Congresses.
Geology--Turkey--Biga Peninsula--Congresses.
Princeton subject headings:
Biga Peninsula (Turkey)--Description and travel--Congresses.
Geology--Turkey--Biga Peninsula--Congresses.