Head, George O . The auto CAD 3D book / by George O.Head,Charles A.Pietra and Kennth J.L.Segal. - New Delhi : Galgotia Publications , 1990. - 319p. : diagrams ; 25cm . Includes index ISBN: Rs.95.00 (Pbk) Subjects--Index Terms: COMPUTER SCIENCE Dewey Class. No.: 004 / HEA/A