1. Introduction
2. Online IR Systems and Document Databases
   1. Databases
      1. Databases and Indexing
   2. Online Retrieval Systems
   3. IR in Online Retrieval Systems
   4. `Natural Language' Searching
3. Online Public Access Catalogues (OPACs)
   1. OPACs and Their Content
   2. OPACs and End Users
   3. OPACs: Vendors and Products
   4. Alternatives to Vendor OPACs
4. Libraries and Digital Library Projects
5. Trends and Research Issues
6. Bibliographic Discussion

By E. Rasmussen