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Improved factor estimating with quantity and manhour ratios
Groen, B., (1977)
Estimator's piping manhour manual : John S. Page and James J. Natioa, published by Gulf Publishing Company, Book Division, Houston, Texas, Third Edition, 220 pages, price U.S. $ 18 (approx.)
The American Association of Cost Engineers (AACE) 21st annual meeting. Milwaukee, WI, U.S.A. June 26-29, 1977