الطبعة الحادية و العشرون من نظام تصنيف ديوي العشري

الملخص EN

Dewey Decimal Classification System is to be considered one of the most important & widely spreaded system.

In this article the researcher discusses the 21st edition of the system which was relative indexes tables and additions, asking institutions & individuals to cooperate for the acceleration of Arabization of this edition and its publishing and guaranteing the continuity of its updating.