TY  - BOOK
AU  - Head, George O.
AU  - Pietra, Charles A.
AU  - Segal, Kenneth J L.
TI  - Autocad 3D book
U1  - 620.00420285  1
PY  - 1990///
CY  - New Delhi
PB  - Galgotia Publication Pvt Ltd
KW  - Learning the ropes
KW  - AutoCADs user coordinate system
ER  -