Columbia subject headings:
Libraries--Balkan Peninsula--Congresses.
Libraries--Turkey--Congresses.
Library cooperation--Balkan Peninsula--Congresses.
Library science--Balkan Peninsula--Congresses.
Library science--Turkey--Congresses.
Harvard subject headings:
Library cooperation--Balkan Peninsula--Congresses.
Library science--Balkan Peninsula--Congresses.
Library science--Congresses
Princeton subject headings:
Libraries--Balkan Peninsula--Congresses.
Libraries--Turkey--Congresses.
Library cooperation--Balkan Peninsula--Congresses.
Library science--Balkan Peninsula--Congresses.
Library science--Turkey--Congresses.