Columbia subject headings:
Classification.
Information storage and retrieval systems.
Harvard subject headings:
Classification--Congresses.
Collection management (Libraries)--Congresses.
Database searching--Congresses.
Information organization--Congresses.
Information organization--Technological innovations--Congresses.
Information retrieval--Congresses
Information storage and retrieval systems--Congresses
Princeton subject headings:
Classification.
Information storage and retrieval systems.