TY  - BOOK
AU  - Houghton, Bernard.
AU  - Convey, John.
TI  - On-line information retrieval systems: : An introductory manual to principles and practice
SN  - 0208016600
U1  - 025.302854 
PY  - 1977///
CY  - London: 
PB  - Clive Bingley , 
KW  - Boolean logic
KW  - Information retrieval
KW  - Library science
KW  - On-line access
ER  -