TY  - GEN
AU  - Perreault, J M.
TI  - Towards a theory for UDC: : essays aimed at structural understanding and operational improvement
SN  - 0851570798
U1  - 025.432 
PY  - 1969///
CY  - London
PB  - Clive Bingley
KW  - Classification, Universal-Decimal
ER  -