Dhyani, Pushpa. Working with Dewey decimal classification : editions 19 and 20 / Pushpa Dhyani. - New Delhi : Vikas, c 1994. - vii,169 p. ; 22 cm. 300 300 ISBN: 0-7069-7623-1 Subjects--Topical Terms: Library Science--ClassificationClassification--knowledge Dewey Class. No.: 025.4 / D539w