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Head G.O, Pietra C.A, . (1994). Auto CAD 3D Book. New Delhi: C.D. Calsetra Publication.
Head G.O, Pietra C.A, . 1994. Auto CAD 3D Book. New Delhi: C.D. Calsetra Publication.
Head G.O, Pietra C.A, . Auto CAD 3D Book. New Delhi: C.D. Calsetra Publication. 1994.