Dewey decimal classification and relative index : v. 1. Introduction , tables / devised by Melvil Dewey ; John P. Comaromi ... [et al]. DDC 20. Dewey, Melvil, 1851-1931. Comaromi, John P. (John Phillip), 1937- ed. Dewey decimal Classification . Z696 .D519 1989 025.431 20 DED Cover title: DDC 20 : Dewey decimal classification. Previous ed.: 1979. New York : Forest Press, 1989. 1989. 1989 Text 4 v. ; eng