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Retraction: Sarireh, M., Najafi, M., Han, C. (2013). “ANOVA Analysis Applied on Factors Which Are Assumed to be Related to Horizontal Directional Drilling Productivity.” <i>J. Pipeline Syst. Eng. Pract.,</i> 10.1061/(ASCE)PS.1949-1204.0000138 (Jan. 19, 2013)
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