Columbia subject headings:
Book industries and trade--Congresses.
Book industries and trade--Developing countries--Congresses.
Books and reading--Congresses.
Books and reading--Developing countries--Congresses.
Books--Prices--Congresses.
Harvard subject headings:
Book industries and trade--Congresses
Book industries and trade--Developing countries--Congresses.
Books and reading--Congresses
Books and reading--Developing countries--Congresses.
Books--Prices--Congresses.
Princeton subject headings: