, .
UDC: Universal Decimal Classification / by British Standards Institution. - 3rd ed / - London : British Standard Institution , 2005 - 2 vols ;
978-0-580-45469-1
Library- Classification-UDC
2:51M96 / P5.2;9
UDC: Universal Decimal Classification / by British Standards Institution. - 3rd ed / - London : British Standard Institution , 2005 - 2 vols ;
978-0-580-45469-1
Library- Classification-UDC
2:51M96 / P5.2;9