4 1 20 Dewey Decimal Classification and Relatif Index, Edition 20 Volume 4:Relative Index, Manual Dewey, Mevil Primary Author mixed material 0910608377 New York Forest Press 1989 Dewey Decimal Classification and Relatif Index, Edition 20 Volume 3:Schedules 600-999 Dewey, Mevil Primary Author mixed material 0910608377 New York Forest Press 1989 Dewey Decimal Classification and Relative Index, Edition 20 Volume 2:Schedules 000-599 Dewey, Mevil Primary Author mixed material 0910608377 New York Forest Press 1989 Dewey Decimal Classification and Relative Index, Edition 20 Volume 1:Introduction, Tables Dewey, Mevil Primary Author mixed material 0910608377 New York Forest Press 1989