Perreault, J. M., 1931-2001 Towards a theory for UDC : essays aimed at structural understanding and operational improvement / J. M. Perreault - London : Clive Bingley, 1969 - 241 p. : ill. ; 23 cm. ISBN: Rs. 45.00 Subjects--Topical Terms: Classification, Universal decimal Dewey Class. No.: 025.4