00597nam a2200217 a 4500 0580330451 (pbk.) MAIN Z696 UNI Universal decimal classification / BSI. Pocket edtion. London : British Standards Institution, 1999. 288 p. ; 18 cm. Includes Index. UDC classification scheme. .b10265983 16-09-09 11-09-09 20230123124945.0 NUST BOOKS Z696 UNI 133221 133221