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Birdie G.S, . (1981). Text Book of Estimating and Costing. Delhi: Dhanpat Rai & Sons Delhi.
Birdie G.S, . 1981. Text Book of Estimating and Costing. Delhi: Dhanpat Rai & Sons Delhi.
Birdie G.S, . Text Book of Estimating and Costing. Delhi: Dhanpat Rai & Sons Delhi. 1981.