Columbia subject headings:
Digital libraries--Congresses.
Library information networks--Congresses.
Online information services--Congresses.
Harvard subject headings:
Database management--Congresses
Digital libraries--Congresses.
Information storage and retrieval systems--Congresses
Libraries--Automation--Congresses
Online data processing--Congresses.
Online databases--Congresses.
Princeton subject headings:
Digital libraries--Congresses.
Online information services--Congresses.