00506nam a2200145Ia 4500008004100000020001500041041000800056082002200064100005900086245013200145250000600277260005100283300001400334650001200348210716s1996    xx            000 0 und d  a8175150602  aeng  a620.00420285 HEAG  aHead, George O; Pietra, Charles A; Segal, Kenneth J L.  aAutocad 3D book: covers through autocad release 13 for dos and windows.bCovers through autocad release 13 for dos and windows.  a1  aNew DelhibGalgotia Publications Pvt Ltdc1996  acxl,319,5  aAutocad