Dewey decimal classification and relative index / edited by Joan S. Mitchell ... [et al.]. - Edition 21 - Albany, New York : Forest Press, 1996. - 4 vol. , 23 cm. Volume 1: Introduction, tables - Volume 2: Schedules 000-599 - Volume 3: Schedules 600-999 - Volume 4: Index, manual Inglés ISBN: 0910608512 Subjects--Index Terms: Bibliographic classification Clasificación bibliográfica Dewey Class. No.: 025.431