Batty, C.D . An introduction to the nineteeth edition of the Dewey Decimal Classification / C.D.Batty. - London : Clive Bingley , 1981. - 171p. : chart ; 22cm . Includes index ISBN: 0851573037 UKP 6.95 Subjects--Index Terms: DDC Dewey Class. No.: 025.43 / BAT/I