TY  - BOOK
AU  - Head,George O  .
AU  - Pietra,Charles A  .
AU  - Segal,Kennth J L  .
TI  - The auto CAD 3D book / 
U1  - 004 
PY  - 1990///
CY  - New Delhi : 
PB  - Galgotia Publications , 
KW  - COMPUTER SCIENCE
N1  - Includes index
ER  -