TY  - BOOK
AU  - Perry, J W
AU  - Kent, Allen
TI  - Documentation and information retrieval: : An introduction basic principles and cost analysis 
PY  - 1957///
CY  - Ohio: 
PB  - Ther Press of Western Reserve University and Interscience Publishers, Inc.
KW  - Library science
KW  - Classification system
KW  - Graphic records
ER  -