An introduction to UDC/
Sehgal, R. L.
An introduction to UDC/ R. L. Sehgal - New Delhi: Ess Ess Publication, 2002. - 266 p.
025.432 / SEH/I
An introduction to UDC/ R. L. Sehgal - New Delhi: Ess Ess Publication, 2002. - 266 p.
025.432 / SEH/I