Principles of information retrieval /
xix, 203 p. illus. 23 cm. - (Information sciences series ) Content notes : 1. Background to development of theory --
2. The environment of an information retrieval system --
3. Information and representation in topics --
4. Documentation --
5. Users and uses --
6. Topics and directories --
7. Specifying an information retrieval system --
8. Problems and issues.