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Cost estimating manual for pipelines and marine structures : by John S. Page, published by: Gulf Publishing Company Book Division, Houston, TX, 316 pages, price approximate $ 24.
Groen, B., (1978)
Improved factor estimating with quantity and manhour ratios
Groen, B., (1977)
The American Association of Cost Engineers (AACE) 21st annual meeting. Milwaukee, WI, U.S.A. June 26-29, 1977