TY  - GEN
AU  - Head, George O.
AU  - Segal, Kenneth J.L.
AU  - Pietra, Charles A.
TI  - The AutoCAD 3D book: covers through AutoCAD release 12
U1  - 670.285 
PY  - 1994///
CY  - New Delhi
PB  - Galgotia publications
KW  - DATA PROCESSING
KW  - COMPUTER APPLICATIONS
ER  -